quakespasm 0.96.3

Version 0.96.3 of QuakeSpasm is released.

Changes since the previous version:

• Fix potential infinite loop when playing sounds with loop start >= end
  (e.g. misc/forcefield.wav from Madfox's kaptlog.zip)
• Fix possible overflow when resampling very big sounds (e.g. gram1.wav
  from the 'A day like no other' mod.)
• Change Sky_ClipPoly to allocate on the heap in if MAX_CLIP_VERTS limit
  is reached (e.g. with lim_daviddg from Liminal Spaces Jam)
• Minor code cleanups. Updates to third party code.
• Thanks to Andrei Drexler, Vincent Sonnier, Alexey Lysiuk, and Jaycie
  Ewald for patches.