Split out attachment handling from message handler

Author: TheArcaneBrony

assets/openapi.json

@@ -12327,7 +12327,7 @@
                             "mentions": {
                                 "type": "array",
                                 "items": {
-                                    "type": "string"
+                                    "$ref": "#/components/schemas/PartialUser"
                                 }
                             },
                             "mention_roles": {
@@ -12391,6 +12391,92 @@
                     "message"
                 ]
             },
+            "PartialUser": {
+                "type": "object",
+                "properties": {
+                    "id": {
+                        "description": "A Twitter-like snowflake, except the epoch is 2015-01-01T00:00:00.000Z\n```\nIf we have a snowflake '266241948824764416' we can represent it as binary:\n\n64                                          22     17     12          0\n 000000111011000111100001101001000101000000  00001  00000  000000000000\n      number of ms since Discord epoch       worker  pid    increment\n```",
+                        "type": "string"
+                    },
+                    "username": {
+                        "type": "string"
+                    },
+                    "discriminator": {
+                        "type": "string"
+                    },
+                    "global_name": {
+                        "type": "string",
+                        "nullable": true
+                    },
+                    "avatar": {
+                        "type": "string",
+                        "nullable": true
+                    },
+                    "avatar_decoration_data": {
+                        "anyOf": [
+                            {
+                                "$ref": "#/components/schemas/AvatarDecorationData"
+                            },
+                            {
+                                "type": "null"
+                            }
+                        ]
+                    },
+                    "collectibles": {
+                        "anyOf": [
+                            {
+                                "$ref": "#/components/schemas/Collectibles"
+                            },
+                            {
+                                "type": "null"
+                            }
+                        ]
+                    },
+                    "display_name_styles": {
+                        "anyOf": [
+                            {
+                                "$ref": "#/components/schemas/DisplayNameStyle"
+                            },
+                            {
+                                "type": "null"
+                            }
+                        ]
+                    },
+                    "primary_guild": {
+                        "anyOf": [
+                            {
+                                "$ref": "#/components/schemas/PrimaryGuild"
+                            },
+                            {
+                                "type": "null"
+                            }
+                        ]
+                    },
+                    "bot": {
+                        "type": "boolean"
+                    },
+                    "system": {
+                        "type": "boolean"
+                    },
+                    "banner": {
+                        "type": "string",
+                        "nullable": true
+                    },
+                    "accent_color": {
+                        "type": "integer",
+                        "nullable": true
+                    },
+                    "public_flags": {
+                        "type": "integer"
+                    }
+                },
+                "required": [
+                    "avatar",
+                    "discriminator",
+                    "id",
+                    "username"
+                ]
+            },
             "MessageComponent": {
                 "type": "object",
                 "properties": {
@@ -12882,92 +12968,6 @@
                     "type"
                 ]
             },
-            "PartialUser": {
-                "type": "object",
-                "properties": {
-                    "id": {
-                        "description": "A Twitter-like snowflake, except the epoch is 2015-01-01T00:00:00.000Z\n```\nIf we have a snowflake '266241948824764416' we can represent it as binary:\n\n64                                          22     17     12          0\n 000000111011000111100001101001000101000000  00001  00000  000000000000\n      number of ms since Discord epoch       worker  pid    increment\n```",
-                        "type": "string"
-                    },
-                    "username": {
-                        "type": "string"
-                    },
-                    "discriminator": {
-                        "type": "string"
-                    },
-                    "global_name": {
-                        "type": "string",
-                        "nullable": true
-                    },
-                    "avatar": {
-                        "type": "string",
-                        "nullable": true
-                    },
-                    "avatar_decoration_data": {
-                        "anyOf": [
-                            {
-                                "$ref": "#/components/schemas/AvatarDecorationData"
-                            },
-                            {
-                                "type": "null"
-                            }
-                        ]
-                    },
-                    "collectibles": {
-                        "anyOf": [
-                            {
-                                "$ref": "#/components/schemas/Collectibles"
-                            },
-                            {
-                                "type": "null"
-                            }
-                        ]
-                    },
-                    "display_name_styles": {
-                        "anyOf": [
-                            {
-                                "$ref": "#/components/schemas/DisplayNameStyle"
-                            },
-                            {
-                                "type": "null"
-                            }
-                        ]
-                    },
-                    "primary_guild": {
-                        "anyOf": [
-                            {
-                                "$ref": "#/components/schemas/PrimaryGuild"
-                            },
-                            {
-                                "type": "null"
-                            }
-                        ]
-                    },
-                    "bot": {
-                        "type": "boolean"
-                    },
-                    "system": {
-                        "type": "boolean"
-                    },
-                    "banner": {
-                        "type": "string",
-                        "nullable": true
-                    },
-                    "accent_color": {
-                        "type": "integer",
-                        "nullable": true
-                    },
-                    "public_flags": {
-                        "type": "integer"
-                    }
-                },
-                "required": [
-                    "avatar",
-                    "discriminator",
-                    "id",
-                    "username"
-                ]
-            },
             "HubGuild": {
                 "type": "object",
                 "properties": {