* UnkStruct_027e0ce0_30_001 OK
* UnkStruct_027e0ce0_40_Base_001 OK
* item manager files stuff
* ItemManager_001 OK
* other file things
* forgot to delete a file
* UnkStruct_027e0ce0_001 53%
* UnkStruct_027e0ce0_001 OK
* merge headers from nitro decomp
* cleanup: use inlines from g2.h and gx.h when changing registers
* cleanup: remove externs declarations in source files