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

strat: fixes for compat with latest libnx

sf: PrepareForErrorReply is common to all objects

libstrat: enable lto

strat: split out common functionality for future meso use

namespace sts -> namespace ams ...

namespace sts::ams -> ams::exosphere, ams::.

This is to facilitate future use of ams:: namespace code in
mesosphere, as we'll want to include ams::util, ams::result, ams::svc...

Results: Implement namespaced, type-safe results. ...

Because I was working on multiple things at once, this commit also:
- Adds wrappers for/linker flags to wrap CXX exceptions to make them
  abort. This saves ~0x8000 of memory in every system module.
- Broadly replaces lines of the pattern if (cond) { return ResultX; }
  with R_UNLESS(!cond, ResultX());.
- Reworks the R_TRY_CATCH macros (and the result macros in general).

libstrat: fix domain issues. in/out objects now work.

sf: implement mitm forwarding + domains.