This is a leftover from the Gateway era that has long lost its utility
and that unnecessarily complicated the code base.
Please just load an external FIRM from SD card if you need something
similar.
Also refactor the multi-EmuNAND code and CTRNAND mounting code.
Upgrade process always copied sdmc:/boot.firm to nand:/boot.firm even if
Luma3DS was chainloaded from another path.
Fix this by copying from argv[0], if Luma3DS was launched from the SD
card.
Also use "sdmc:" and "nand:" instead of "0:" and "1:" when using FatFS.
Closes#1776.
- Add support for saving screen filters color temperature and NTP timezone offset (you still need to go to misc->save config)
- some advanced options moved to "in ini file only"; "patch games" is now enabled by default
- ntp: fix support for UTC+12 to +14
- remove deprecated custom svc 0x2e
