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/buttons/guiIconButtonCtrl.h

@@ -30,6 +30,7 @@
 #include "gfx/gfxTextureManager.h"
 #endif
 
+#include "T3D/assets/ImageAsset.h"
 
 /// The GuiIconButtonCtrl draws an icon and text caption within a normal
 /// button control with several layout options.
@@ -41,8 +42,9 @@ private:
 
 protected:
 
-   StringTableEntry  mBitmapName;
-   GFXTexHandle      mTextureNormal;
+   DECLARE_IMAGEASSET(GuiIconButtonCtrl, Bitmap, onImageChanged, GFXTexturePersistentSRGBProfile);
+   DECLARE_IMAGEASSET_SETGET(GuiIconButtonCtrl, Bitmap);
+
    S32               mIconLocation;
    S32               mTextLocation;
    S32               mTextMargin;
@@ -57,10 +59,6 @@ protected:
    /// Calculate extent based on icon size, text width, and layout options.
    bool mAutoSize;          
 
-   //  Optional bitmap to be displayed when the proper bitmap cannot be found
-   StringTableEntry mErrorBitmapName;
-   GFXTexHandle mErrorTextureHandle;
-
    void renderButton( Point2I &offset, const RectI& updateRect);
 
    enum 
@@ -114,6 +112,8 @@ public:
    void setErrorBitmap(const char *name);
 
    void onRender(Point2I offset, const RectI &updateRect);
+
+   void onImageChanged() {}
 };
 
 typedef GuiIconButtonCtrl::TextLocation GuiIconButtonTextLocation;