ams: overhaul fs.mitm romfs ownership, bump to 1.2.4

git subrepo pull (merge) libraries ...

subrepo:
  subdir:   "libraries"
  merged:   "8764bd406"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "12d0ba172"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

ams: bump api version to 1.2.3

ams: update for awareness of architecture revision

ams: bump version to 1.2.2

ams: bump version to 1.2.1

sprof: update for 13.1.0 (format version 1)

crypto: implement md5, which now used by sprof

kern: implement 13.1.0 kernel changes

util: add trait/macro for is_constexpr_constructible

kern/test: add wip qemu-virt board support to mesosphere

kern: optimize timespan -> tick codegen, improve .text layout

kern: avoid constexpr init for many objects (avoids unnecessary memory clear) (#1668)

kern: use new AtomicRef, use Atomic<bool>

util: better match true std::atomic semantics

kern/util: use custom atomics wrapper to substantially improve codegen

kern: update scheduler for 13.0.0 change, fix some ctz/clz bugs

ams: improve offsetof style consistency

util: improve (and use) offsetof that's """standard compliant"""

constexpr: resign ourselves to gcc dropping void -> T support

kern/util: update structure layouts to match Nintendo (saves 0x10 per KThread/KSession)

util: fix consteval CountTrailingZeroes impl

ams: bump api verrsion pre-emptively to 1.2.0

loader: refactor ro manager/improve accuracy

spl: refactor for accuracy/move into libstrat

svc: use m_ for member variables

exo/vapours: refactor member variables to m_ over this->

ams: replace most remaining operator & with std::addressof

settings: implement KeyValueStore (#1659) ...

* settings: implement KeyValueStore and dependencies

* settings: update KeyValueStore for recent refactoring

* settings: address feedback

libstrat: enable -Wextra, -Werror ...

This caught an embarrassingly large number of bugs.