Allow dragging and dropping of Entities in editor

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

GlitchyEditor/src/ImGuiExtension.bf

@@ -0,0 +1,33 @@
+using System;
+
+namespace ImGui;
+
+enum DragDropPayloadType
+{
+	case ContentBrowserItem;
+	case Entity;
+
+	public String GetName()
+	{
+		switch (this)
+		{
+		case .ContentBrowserItem:
+			return "CONTENT_BROWSER_ITEM";
+		case .Entity:
+			return "ENTITY";
+		}
+	}
+}
+
+extension ImGui
+{
+	public static Payload* AcceptDragDropPayload(DragDropPayloadType type, DragDropFlags flags = .None)
+	{
+		return AcceptDragDropPayload(type.GetName(), flags);
+	}
+
+	public static bool SetDragDropPayload(DragDropPayloadType type, void* data, size sz, Cond cond = .None)
+	{
+		return SetDragDropPayload(type.GetName(), data, sz, cond);
+	}
+}