fix stupid bug in ca causing bad reads

also just ignore compiled scalers for now
fix some immediate/obvious issues

- add target to gitignore
- screenseg is now a buffer in memory (for EGA anyway), 4 "planes" of 320x200
  u32's, but nothing is actually adjusted for that yet; in particular,
  freelatch et al are meaningless now
- pebcak bug in ca; invalid free's in game
- vwa: mark VW_SetScreen as nonfunctional

program now runs waiting for input in IN_UserInput() while timer never
increments.