SDL: Backport latest gui changes from GCW-Zero's FBA
BURN: Remove unneeded SndInit() call inside BurnSetRefreshRate()

  This eliminates multiple sound reinitializing.
SDL: AUDIO: Fix for legacy dingux: SDL sample size must be a power of 2
SEK: Properly switch to m68k core if 68010 or 680EC20
SDL: Don't save app config if run as command-line without gui.
A68k: Import a68k-mips from GCW-Zero
BURN: Remove completely cache support, it was broken anyway
A320: Remove cache support from os-dependent code
A320: Remove swap and frontend options completely
Prepair for move to 0.2.96.86
Bump to FBA 0.2.96.86
A68k-mips: Fix Makefile.dingux