Build 8533
SVN-
Fix -Wunused-parameter warnings
SVN handles and Git names are merged into one person.
Fix -Wunused-parameter warnings
Add #ifdef USE_OPENGL forgotten in r5024 that causes an OOB access in scansector() and glitchy mirrors with USE_OPENGL=0.
Add vox_undefine().
Clean up texcache_enabled.
Add one-bit alpha detection for hightile and model skins.
Move daskinloader into mdloadskin and clean up it and gloadtile_hi against one another.
Rename HICR_NOCOMPRESS to HICR_NODOWNSIZE, CACHEAD_NOCOMPRESS to CACHEAD_NODOWNSIZE, DAMETH_NOCOMPRESS to DAMETH_NODOWNSIZE, and HICR_NOSAVE to HICR_NOTEXCOMPRESS.
Add E_PostInit, called from the game after loaddefinitionsfile().
Remove some conditional disabling of spriteext features when !defined USE_OPENGL.