Remove hook system dependency for base plugin functions

Some plugins depended certain hooks being called to be able to work correctly. This switches to a more efficient event based system for base plugin functions.

Author: austinv900

src/CSharpPlugin.cs

@@ -314,6 +314,9 @@ public override void HandleAddedToManager(PluginManager manager)
                 Watcher.AddMapping(Name);
             }
 
+            Manager.OnPluginAdded += OnPluginLoaded;
+            Manager.OnPluginRemoved += OnPluginUnloaded;
+
             foreach (var member in pluginReferenceMembers)
             {
                 if (member.Value.MemberType == MemberTypes.Property)
@@ -353,6 +356,9 @@ public override void HandleRemovedFromManager(PluginManager manager)
 
             Watcher.RemoveMapping(Name);
 
+            Manager.OnPluginAdded -= OnPluginLoaded;
+            Manager.OnPluginRemoved -= OnPluginUnloaded;
+
             foreach (var member in pluginReferenceMembers)
             {
                 if (member.Value.MemberType == MemberTypes.Property)
@@ -438,8 +444,7 @@ public void SetFailState(string reason)
             throw new PluginLoadFailure(reason);
         }
 
-        [HookMethod("OnPluginLoaded")]
-        private void base_OnPluginLoaded(Plugin plugin)
+        private void OnPluginLoaded(Plugin plugin)
         {
             if (pluginReferenceMembers.TryGetValue(plugin.Name, out MemberInfo member))
             {
@@ -455,8 +460,7 @@ private void base_OnPluginLoaded(Plugin plugin)
             }
         }
 
-        [HookMethod("OnPluginUnloaded")]
-        private void base_OnPluginUnloaded(Plugin plugin)
+        private void OnPluginUnloaded(Plugin plugin)
         {
             if (pluginReferenceMembers.TryGetValue(plugin.Name, out MemberInfo member))
             {