Update PuzzleScriptPlus graphics source to allow custom font to work.
Only clear all sprite context when in PuzzleScript mode.
Use PuzzleScriptPlus mode on pzp files.
Make custom font off by default.
Add cheat code of SELECT+START to skip level.
Fix bugs discovered with Singleton Traffic game (level 3 graphics glitch).
Dynamically resize sprites if pixels drawn with fillRect beyond border.
Update sprite clearing to always clear all of updated width and height.