Set up build system and disassembly for ntsc-1.2 (#2021)

* Set up build system for ntsc-1.2

* Set up disassembly for ntsc-1.2

* Add all unnamed functions to functions.txt

* Update docs/retail_versions.md for ntsc-1.2

* Format

* Update docs/retail_versions.md

Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

* Remove mention of US

* OOT_N64 -> PLATFORM_N64, OOT_GC -> PLATFORM_GC

* Move mtxutil to libultra/gu

* Fix libultra/io bss splits

* Fix merge

---------

Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

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