replaced character frames with white ones - tinting on draw
preparing to add more levels and a level selection screen:
 removed World, Level-related stuff is now in Levels
 added and using LevelSelectEvent
 added dummy LevelSelectScreen - not currently in use
 added dummy WeaponsLabLevel - not currently in use
added working LevelSelectScreen
added "select level" option to the dialogs
removed clutter from both 'lab' levels
Avatar can carry a weapon and shoot again