feat: use new UiBuilder class for plugins, DalamudPluginInterface is now IDisposable

Dalamud/Interface/InterfaceManager.cs

@@ -32,7 +32,7 @@ namespace Dalamud.Interface
         private RawDX11Scene scene;
 
         /// <summary>
-        /// This event gets called when ImGUI is ready to draw your UI.
+        /// This event gets called by a plugin UiBuilder when read
         /// </summary>
         public event RawDX11Scene.BuildUIDelegate OnDraw;
 
@@ -109,14 +109,7 @@ namespace Dalamud.Interface
             // Doing this here because it's somewhat application-specific behavior
             ImGui.GetIO().MouseDrawCursor = ImGui.GetIO().WantCaptureMouse;
 
-            // invoke all our external ui handlers, giving each a custom id to prevent name collisions
-            // because ImGui control names are globally shared
-            foreach (var del in this.OnDraw?.GetInvocationList())
-            {
-                //ImGui.PushID(someId);
-                del.DynamicInvoke();
-                //ImGui.PopID();
-            }
+            OnDraw?.Invoke();
         }
     }
 }

Dalamud/Interface/UiBuilder.cs

@@ -0,0 +1,35 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ImGuiNET;
+using ImGuiScene;
+
+namespace Dalamud.Interface
+{
+    public class UiBuilder : IDisposable {
+        private readonly string namespaceName;
+
+        public event RawDX11Scene.BuildUIDelegate OnBuildUi;
+
+        private InterfaceManager interfaceManager;
+
+        public UiBuilder(InterfaceManager interfaceManager, string namespaceName) {
+            this.namespaceName = namespaceName;
+
+            this.interfaceManager = interfaceManager;
+            this.interfaceManager.OnDraw += OnDraw;
+        }
+
+        public void Dispose() {
+            this.interfaceManager.OnDraw -= OnDraw;
+        }
+
+        private void OnDraw() {
+            ImGui.PushID(this.namespaceName);
+            OnBuildUi?.Invoke();
+            ImGui.PopID();
+        }
+    }
+}