md: vdp improvements, dots and stuff

[TascoDLX]

• Completes [MD] CRAM dots are not emulated #1498 -- dots should be clearly visible in overscan areas normally. If you notice odd dots appearing on top of games irregularly (inbounds, non-overscan), please mention it. The Direct Color DMA demos (https://gendev.spritesmind.net/forum/viewtopic.php?f=8&t=1203) should be stable for the most part (note, they are very timing sensitive).
• VDPFIFOTesting rom should run without any failures. Previously, 16-FIFO Wait States was the only failed test.
• Both Titan Overdrive demos should run cleanly. There were a few minor wrinkles that needed to be ironed out.
• Fixes [MD] International Superstar Soccer Deluxe: Flickering line #1075 -- there was a minor adjustment for a window edge case in H32 mode. Unlikely to affect other games.
• Fixes [MD] Sonic The Hedgehog 2: 2 Player VS mode graphical bug #1061 -- looks pretty clean now.
• Fixes [MD] Striker: flickering lines on the field #626 -- I don't notice anything weird currently, just some minor fringe in the left border, not visible when overscan is disabled.
• Review [MD/SNES] Hiding overscan in games cuts off too much of the screen #1675 wrt md -- there are no parts of the active display area that are currently cropped out. There was an unreported issue with Exo Squad (E) that had clipped the topmost lines in PAL V30 mode (observed on the copyright screen) but that has been fixed.
• Fixes an unreported bug in 32X PWM sound (right channel was missing), typo from previous commit d7dfae7.

[LukeUsher]

Excellent!