Fixed up the -netquake / -spasm / -fitz args slightly, should actually be usable now.
sv_mintic 0 is now treated as 0.013 when using nqplayerphysics, to try to make it smoother for nq clients.
Preparing for astc's volume formats. Mostly for completeness, I was bored. Disabled for now because nothing supports them anyway.
Fix broken mousewheel in SDL2 builds.
Fix configs not getting loaded following initial downloads in the web port/etc.
Make the near-cloud layer of q1 scrolling sky fully opaque by default (like vanilla).
Sky fog now ignores depth, treating it as an infinite distance.
Fix turbs not responding to fog.
r_fullbright no longer needs vid_reload to take effect (and more efficient now).
Tweaked the audio code to use an format enum instead of byte width, just with the same values still, primarily to clean up loaders that deal with S32 vs F32, or U8 vs S8.
Added a cvar to control whether to use threads for the qcgc. Still disabled by default but no longer requires engine recompiles to enable!
git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@5683 fc73d0e0-1445-4013-8a0c-d673dee63da5
support RLE+luminance+alpha tga files.
support half-float tga files.
recognise hdr astc images.
added appropriate fallbacks for astc support.
load mip-less .astc files (mostly just for debugging stuff).
allow packages to warn about required engine/gpu features.
catch when stdin flags get changed to blocking by external libraries, to avoid fatal stalls.
basic support for .mdx files (kingpin models)
sort packages loaded via wildcards, by datetime then name, to avoid random ordering from certain filesystems.
git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@5531 fc73d0e0-1445-4013-8a0c-d673dee63da5
