Add GetPluginErrors helper method & refactor plugin errors

Author: scorteanucosmin

src/OxideMod.cs

@@ -509,7 +509,7 @@ public bool PluginLoaded(Plugin plugin)
             {
                 if (plugin.Loader != null)
                 {
-                    plugin.Loader.PluginErrors[plugin.Name] = ex.Message;
+                    plugin.Loader.GetPluginErrors(plugin.Name).Add(ex.Message);
                 }
 
                 LogException($"Could not initialize plugin '{plugin.Name} v{plugin.Version}'", ex);

src/Plugins/CSPlugin.cs

@@ -135,7 +135,7 @@ public override void HandleAddedToManager(PluginManager manager)
                 Interface.Oxide.LogException($"Failed to initialize plugin '{Name} v{Version}'", ex);
                 if (Loader != null)
                 {
-                    Loader.PluginErrors[Name] = ex.Message;
+                    Loader.GetPluginErrors(Name).Add(ex.Message);
                 }
             }
 

src/Plugins/PluginLoader.cs

@@ -22,9 +22,9 @@ public abstract class PluginLoader
         public Dictionary<string, Plugin> LoadedPlugins = new Dictionary<string, Plugin>();
 
         /// <summary>
-        /// Stores the last error a plugin had while loading
+        /// Stores the errors a plugin had while loading
         /// </summary>
-        public Dictionary<string, string> PluginErrors { get; } = new Dictionary<string, string>();
+        public Dictionary<string, HashSet<string>> PluginErrors { get; } = new Dictionary<string, HashSet<string>>();
 
         /// <summary>
         /// Stores the names of core plugins which should never be unloaded
@@ -141,5 +141,16 @@ public virtual void Reload(string directory, string name)
         public virtual void Unloading(Plugin plugin)
         {
         }
+
+        public HashSet<string> GetPluginErrors(string name)
+        {
+            if (!PluginErrors.TryGetValue(name, out HashSet<string>? errors))
+            {
+                errors = new HashSet<string>();
+                PluginErrors[name] = errors;
+            }
+
+            return errors;
+        }
     }
 }