[FREELDR] Add variable for default text color

On PC/AT-compatible machines it's Gray, and on NEC PC-98 series it's White.

[XBOX] Move NV2A XGPU definitions into header file

TODO: helper functions should be also moved. CORE-16216

[FREELDR] Add vertical screen scrolling for Xbox with console mode (#2745)

Also turn off debug messages to screen before setting up the CPU (To print a character to the screen on some ports the MMIO

[FREELDR] Add vertical screen scrolling for Xbox with console mode (#2745)

Also turn off debug messages to screen before setting up the CPU (To print a character to the screen on some ports the MMIO access should be executed, so it throws an exception).

CORE-16216

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[FREELDR] Work with Xbox GPU memory registers properly

Bug was noticed with GCC 8.4

[FREELDR] Minor code improvements

- Add missing allocation check in DetectApmBios()
- Check 'PM' signature in FindApmBios()
- Properly set machine type in hardware detection
- Set Component->Key val

[FREELDR] Minor code improvements

- Add missing allocation check in DetectApmBios()
- Check 'PM' signature in FindApmBios()
- Properly set machine type in hardware detection
- Set Component->Key value for hard drives
- Get rid of the unused XboxBeep()
- Cast Xbox LPC I/O ports to PUCHAR
- Improve shadow rendering with VGA font
- Include ntoskrnl.h in the proper order

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[FREELDR] Restructure platform-specific code. No code changes.