Try to fix problems caused by (auto)save's screenshots
Added code to allow falling back on stbi for when libpng/libjpeg are not compiled it, at eukara's request.
Handle .exr image files as suggested by eukara, when the appropriate library is available.
Fix mipmaps etc for half-float files.
Enable support for stbi's special gif loader, loading gifs as an 2darray texture.
Add code for threading the qcvm's tempstring recycling, disabled due to paranoia but does otherwise help xonotic perf (at the cost of extra ram).
git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@5548 fc73d0e0-1445-4013-8a0c-d673dee63da5
Changed NOLEGACY to HAVE_LEGACY (the negation was annoying).
Added missing defines to the alternative build configs, and removed some obsolete ones.
Fixed a crash in svc_setportalstate.
git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@5446 fc73d0e0-1445-4013-8a0c-d673dee63da5
Console code no longer makes assumptions about con_main
Screenshots rework, for screenshot_360, but also some other cleanups.
Fixed an issue with beginpolygon (finally).
Added per-rtlight style strings.
Added cvar to control whether ents will be culled by fog.
Added define to disable IPLOG, etc.
Added r_editlights cvar and related commands, for whenever csaddon isn't available.
git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@5338 fc73d0e0-1445-4013-8a0c-d673dee63da5
