Mix patterns are drawn at the correct position now instead of backwards.
Better handling of subsys/subcntl side.
As usual, better handling of the VGA on/off passthrough.
Better handling of the accelerator pitch (TODO: need a way to properly identify 640x480x256 in the pitch side).
ESDI MCA: Increased esdi_time from 200 to 512, should fix the timeout that caused the bad attention 03 fatal.
Rancho: Added the Rancho RT1000B-MC MCA SCSI controller, it uses the 8.20R BIOS.
8514/A: Reworked the Outline command to satisfy the manual and the win2.10 (286/386) driver.
XGA: Initial rom len is set to 0x8000 (which, after being configured, is set back to 0x2000) just to not make it hang with POST code 40 25 on most configurations.
Reduced the number of variables that depend on the main SVGA handler.
Re-implemented accel command 5 (Polygon Boundary Line) right.
Implemented Polygon fill type A and B (latter not tested yet) on accel command 2 per manual.
Fixed crashes when starting Win2.1x using the built-in 8514/A driver.
Some wip cleanups.
