Misc ViRGE fixes.
Changes to memory mapping.
Changes to PCI handling.
Disabled 'AMI WinBIOS 486 PCI' due to incomplete chipset emulation.
Invalid GUS register reads no longer kill the emulator.
- No longer crashes PCem when remapping (mostly seen when changing resolution in Windows)
- Added PCI registers
- Added LFB emulation (PCI only)
- Source pattern modes now work correctly
- Vsync flag now emulated correctly
- Scrolling in accelerator modes now works correctly
Also disabled some debug.