Add back necessary _rscreen.x and y properties.
Rename RomTile2 to RomTile.
Rename tile property to be more meaningful.
Add support for drawing tiles flipped.
Draw tiles flipped that should be.
Add 'use strict' flag to modules.
Declare undefined variables.
Simplify palette color-fetch logic.
Use shorthand addition operator.
Remove unused line.
Fix player getting stuck when stepping between maps.
Remove completed TODO.
Skip drawing of tiles that are off-canvas.