Stop inlining the regular tile drawing code. That was a micro-optimisation, and this revert brings the code a bit closer to mainline Snes9x.
Remove remnants of a failed auto-CPU implementation. Changing CPU speeds on-the-fly is just not stable on the DSTwo.
Synchronise fractions of a hertz correctly in the audio output timing code to avoid buffer overruns. Buffer overruns pause the game for about half a second.