No Boot support for CGB

Description

It should be possible to have no BIOS/boot loading in CGB mode.

Even though it's trickier to achieve than the DMG mode, we should be able to provide this no-boot mode.

Implementation

We must handle the loading of the palettes with care, as it seems to be the trickier part of the process.

To be able to build the Sameboy Boot Rom files, one must use the following:

• RGBDS, for ASM and low-level file manipulation

After that, you should be able to build the boot file using the following:

rgbasm ./res/boot/src/cgb_boot.asm

References

• Sameboy - cgb_boot_fast.asm
• Sameboy - cgb_boot.asm
• https://github.com/LIJI32/SameBoy/blob/7542de74e750738d3405f496eca0c5fbc6108c5b/QuickLook/generator.m#L25
• Pandocs - Boot Sequence