This extension was already being used - however, smRegisterService() was also being used as a fallback method.
More than a year and a half has already passed since this feature was introduced, and both SX OS and ReiNX apparently support it now, so it's a justified change.
* Cancel USB file transfer if something goes wrong during a NSP transfer via USB.
* Added SD card RomFS dumper.
* Further optimizations to the *WriteNcaPatch() functions.
* Change struct naming in nso.c/h (thanks @0Liam !).
* Replace fsp-usb with libusbhsfs. ( ͡° ͜ʖ ͡°)
* Codestyle fixes.
* NCA contexts for NCAs with titlekey crypto will now be generated even if the ticket can't be retrieved, in order to be able to use ncaReadContentFile() with them.
* Moved aes128XtsNintendoCrypt() out of nca.c.
* Updated disclaimer in all source files.
* Improved signed payload (certificate, ticket) handling.
* Prefer strlen + strcmp over strncmp whenever possible.
* Simplify header file inclusions in source files.
* Simplify background gamecard thread logic.
* Properly close keys file handle if there's a key parse error.
* Update NcaKeyGeneration enum.
* Small changes to save.c/h.
Will probably have to revert some USB changes...
