Converts all game, gui editor, and system classes to utilize assets

Processed core, tools and default modules to utilize assets
Converted all console types that were string based, such as TypeImageFilename to utilize const char*/the string table, which avoids a lot of type swapping shenanigans and avoids string corruption
Removed unneeded MainEditor mockup module
Removed some unused/duplicate image assets from the tools

Engine/source/gui/controls/guiPopUpCtrl.h

@@ -38,6 +38,8 @@
 #ifndef _GUISCROLLCTRL_H_
 #include "gui/containers/guiScrollCtrl.h"
 #endif
+
+#include "T3D/assets/ImageAsset.h"
 class GuiPopUpMenuCtrl;
 class GuiPopupTextListCtrl;
 
@@ -115,15 +117,26 @@ protected:
    bool mMouseOver; //  Added
    bool mRenderScrollInNA; //  Added
    bool mReverseTextList;	//  Added - Should we reverse the text list if we display up?
-   StringTableEntry mBitmapName; //  Added
+
+   enum BitmapModes
+   {
+      Normal,
+      Depressed,
+
+      NumBitmapModes = 2
+   };
+
+   DECLARE_IMAGEASSET_ARRAY(GuiPopUpMenuCtrl, Bitmap, GFXDefaultGUIProfile, NumBitmapModes);
+   DECLARE_IMAGEASSET_ARRAY_SETGET(GuiPopUpMenuCtrl, Bitmap);
+
    Point2I mBitmapBounds; //  Added
-   GFXTexHandle mTextureNormal; //  Added
-   GFXTexHandle mTextureDepressed; //  Added
 	S32 mIdMax;
 
    virtual void addChildren();
    virtual void repositionPopup();
 
+   static bool _setBitmaps(void* obj, const char* index, const char* data);
+
 public:
    GuiPopUpMenuCtrl(void);
    ~GuiPopUpMenuCtrl();