Update .gitignore

Ignore Release build
Ignore .atsuo
Space shavings; Formatting

Commented out 2048 UART actuator (This reeks of temporaryness)
Linker:
  Use small vfprintf
  Use relaxation
Compiler:
  Optimize for size
Total size is 92% .text, 80% .data

Removed commented (deprecated) code from pong.c
Fixed some formatting in menu.c