Allow dragging and dropping of Entities in editor

+ New Dictionary Helpers
+ Made ImGui Payloads safer
+ Start of Component drag'n'drop

ScriptCore/Editor/ShowInEditorAttribute.cs

@@ -2,6 +2,12 @@ using System;
 
 namespace GlitchyEngine.Editor;
 
+// TODO: Maybe rename, definitely move into different namespace
+/* Why?
+ * - this attribute also means that the Field is being serialized
+ * - Editor-Namespace wont be available for distribution builds of the game
+ */
+[AttributeUsage(AttributeTargets.Field)]
 public sealed class ShowInEditorAttribute : Attribute
 {
     public string DisplayName { get; set; } = null;