fix GPD_LIMIT_PITCH not properly limiting +lookdown.
fix plugins not auto-loading properly (when previously enabled, obviously).
engine updates now try to replace the 'launcher' binary, instead of chaining from it. this should make firewalls (and other shady special-case gldriver hacks) more consistent at the cost of not being able to revert to your initial revision.
imgtool can now extract from wads.
imgtool now compiles+works on windows (GoaLitiuM's code).
update ffmpeg plugin to handle more recent ffmpeg versions properly.
fix somewhat recent audio streaming bug with openal output.
fix sleep+abort qc builtins.
gltf2 plugin will now work better with blenders no-material files.
git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@5598 fc73d0e0-1445-4013-8a0c-d673dee63da5