pass DDT0101 diag test
fix vmem handler bug with >= 8 handlers
ch2-DMA: use SB_LMMODE1 for upper mirror
dmac: update SAR and DAR according to CHCR.SM and CHCR.DM
use function templates for vram 32b handlers
clean up
implement incremental YUV conversion with pref SQ
implement access to 32bit VRAM with pref SQ
init YUV converter when TA_YUV_TEX_CTRL is set
set FIFO available space to 256 through SB_TFREM reg
fake FIFO status through SB_FFST reg
Originally ported from nullDC to libretro in commits:
2fa562db1b46c52b663b3dd4bb33a64907357458
f8eb58ac16a9e5adf662b99be5d00729264808e0
Modified for use w/ reicast per-game configuration