remove dead sound code no longer needed
pcmconv resampling is not what we need, just do it ourselves.
copy doom's mouse motion logic, default was too slow.
actually exit on main menu quit
use the right names and directories
mkfile: put ourselves in games
more attrs need back, and we were calling InitGraphics twice..
w_wad: restore case insensitive cmp
merge qwx's doom stuff stub sound for now