Finally....

Finally get the visual system integrated into the editor. Now the editor can see the stage as the players see it. The camera control is also implemented.
But this is only a start. Tough road ahead. Hopefully there won't be any unforeseen obstacle that will block the way. The biggest challenge is probably porting the conditional logic in the stage build system into the editor's adding and removing tile function.
The next step would be trying to add the mouse control (mouse indication) back in.

Interesting to note that...it took me more than half a month to get this integration done, ouch. I always thought it would take less time. But I guess it's fortunately enough that any got done at all since I only work on this during spare time.