ams_mitm: implement ns.mitm

Delete pre-rewrite ams_mitm code

ams_mitm: fix directory save bugs

fix uninitialized data access

ams_mitm: Implement savedata redirection

ams_mitm: add titles dir compat shim (to remove in 0.10.1)

ams_mitm: implement automatic backups of biskeys/cal0

shared_from_this requires public inheritance

ams_mitm: Implement emummc Nintendo folder redirection

ams_mitm: implement layeredfs

os/dd: primitive fixes

compat fixes for libnx master

avoid lambda use in shared_ptr deleters

fs.mitm: Implement bis protection

stop overriding user config on update

set_mitm: embed defaults in code, allow for missing ini

ams_mitm: Implement system settings mitm

ams_mitm: Implement set:sys firmwareversion mitm

Implement set_mitm

ams_mitm: implement hid mitm

Add icon for reboot to payload (closes #644)

hbl: support different keys for any-app vs specific ...

This also makes the default configuration:

To override a generic app, hold R.
To override album, do not hold R.

mitm/cfg: pass around override status for decision-making

ams_mitm: implement bpc:mitm

strat: update for latest libnx.

ams_mitm: begin skeleton refactor

sf: explicitly namespace in DEFINE_SERVICE_DISPATCH_TABLE

sf: fixes (basic mitm service functionality now confirmed working)

libstrat: implement mitm server registration

strat: TitleId -> ProgramId, titles->contents