* [HALXBOX] Formatting only.
* [HALXBOX] Don't use Xbox partitions if MBR signature found.
- Fixes BSOD 0x7B when booting from a HDD that have both MBR and BRFR signatures.
- It happens when you format Xbox (BRFR) disk as MBR.
After that "BRFR" signature is still located at sector 3.
- Also fix pre-existing leaks.
CORE-16216 CORE-16329
- Create xbox.cmake based on legacy.cmake and pic.cmake
- Revive Xbox HAL files and add them to the build
- Fix boot with Xbox HAL, add missing parts from halinit_up.c
- Code style and debug logging improvements in pcibus.c
- Allow to choose Xbox HAL in usetup
CORE-16216
