Expanded PRG/CHR flags, FME-7 Mapper Support, random labeling

[kmck]

• Flags to double the CHR and PRG bank size (and pad them out as needed) You could quadruple the PRG size, but that seemed excessive.
• FME-7 mapper support, why not
• Various changes I had made locally at some point
  • Labelled CHR banks for ending and updated a table
  • Labels around the enemy generator table (the better to measure you with)
  • Other table labels
  • More labels for collision routine
  • Labels for sprite slot routine
  • Tile table mode for explicit per-tile definition of collision and other attributes (slippery, quicksand, conveyor, spikes)
  • I guess at some point I determined that enemy state 7 is associated with quicksand?