md3 support
quoth/etc bug fix
strzone bug fix
png/jpg replacement wall textures
rewrote mdl rendering to always use arrays, relaxing vertex+tri limits.
removed static ents limit
fixed ambient_level not working at high framerates.
variables and functions private and did some whitespace tidy-ups.
git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@504 af15c1b1-3010-417e-b628-4374ebc0bcbd