Various progress

1) PS Vita emulation. Some ARMv7 instructions and miscellaneous stuff implemented, basic preparations for HLE.
2) Some warnings fixed. Added checks against wrong memory address in PPU Interpreter and some other places.
3) Little optimization in SPU JIT.
4) cellAdec improved (audio decoder). It doesn't have any visible (hearable) results yet, but sound in video is broken. Beause cellDmux (demuxer) needs improvements too, but they aren't done yet.