Integrate 5.x SMC API changes, add 4.x specific setup, implement target firmware selection

Fix func_copy null deref (?)

Fix latest commit and set MAILBOX_NX_SECMON_BOOT_TIME

Fix coldboot init (presentations lie)

Finish writing warmboot _crt0_

Fix section alignment, attempt to clean up the crt0 a bit

Cleanup TODOs, implement bootconfig SCR_EL3 bit setting

Finish bootup_misc_mmio() - Cur build gets to end of pk2ldr.

Add coldboot mmio init (for non 4.x), required for FLOW writes to succeed.

Fix coldboot init, Exosphere makes it to PK2LDR in this commit.

Rewrite relocation stuff

Implements missings parts of pk2ldr, refactor relocation a bit

Make clear_bss work regardless of load address

Fix tzram_map_all_segments

Can't copy to VAs if VA don't exist (at that point of the program)

Fix the set_memory_registers_enable_mmu call

Fix ttbl init pointer arith bug, other fixes

Clear bss at runtime like Nintendo actually does

Implement flush_dcache_all_tzram_pa and invalidate_icache_all_inner_shareable_tzram_pa for the crt0s

Implement and use set_memory_registers_enable_mmu

Use provided __libc_init_array and __libc_fini_array, bugfixes

Unstub lma2vma code

Rewrite the memory map-related code... ...

...other style fixes, etc.

Failed attempt to fix loops not being unrolled, other fixes.

Move source files to src/, add Makefile, fix all build and linkage errors, etc.