[MP] Revert 80f12fa97d4050cce9f9c1f5fb4e6c0f5d14cced.
Apply several commits from ioq3's shader parser / COM_Parse fixes that were still missing.
Remove deferLoad variable from ded and vanilla renderer tr_shader.cpp

Refs #271.
This does not actually fix the issues seen in #271, but it reverts the behaviors of the improved/optimized parser.  It still contains syntax checking and would need to be adjusted to treat the number signs differently.