code: Add debug prints.
code: Disable the sound code.

The sound code was responsible for a segfault, due to a missing XShm
function.

Disable the sound init code. No sound supported at the moment. Sound
should be supported as an independent sound server (different process).
misc: Add the DOOM1.WAD ressource pack.

DOOM1.WAD is the shareware ressource pack for DOOM.

TODO: Replace DOOM1.WAD with a FreeDOOM ressource pack. Check
FreeDOOM ressource's licensing.
Merge branch 'master' of https://github.com/bmarcot/DOOM