merge 'zeroproject' branch into master, TGDS1.65, DSP

instead of confusing users, and from the maintenance POV, it’s best to keep a ROM_MAX_SIZE if NTR or TWL mode into a single CX4 core branch.

That way, allowing to use extended RAM in TWL mode enables to map directly ROM in memory, and removes duplicate codebase because ‘zeroproject’ was meant to isolate specific extended ROM in TWL mode, but since codebase evolved nicely, it can be merged back into TGDS1.65 branch, and then DSP