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.
This was a long-standing bug since Luma3DS v8.0.
If you changed the homebrew title and didn't immediately reboot, then
the ExHeader during termination would not match the ExHeader that was
was used for loading the process, and thus sysmodule process refcounts
would get all messed up.
The obvious solution to this is to ensure no application is running
while changing the hbldr titleID (hence the changes in custom PM).
This was quite possibly one of the cause of homebrew failing to load
when using N3DS H&S.
... even when HPs aren't inserted.
This is aimed at people using Bluetooth audio hw mods.
There are some software limitations, please read the INI/option
description.
Closes#1828.
