Major improvements / supports stable lsnes

Main differences:
1) Stable version runs fine, but with less features. For instance,
there's no lag count function in the stable version;
2) The mouse can be used to draw the hitbox of a block. Just use the
left click to draw or erase the block;
3) The mouse can be used to draw the hitbox of a sprite. Just use the
right click next to the sprite to draw or erase the hitbox area.
Actually, all sprites in the slot of this sprite are going to be drawn;
4) Right and left clicks are still used to change the transparency of
the text.