ams: std::optional -> util::optional

git subrepo push libraries ...

subrepo:
  subdir:   "libraries"
  merged:   "eb667fea5"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "eb667fea5"
git-subrepo:
  version:  "0.4.0"
  origin:   "???"
  commit:   "???"

docs: add changelog for 0.19.5

ams: basic support for 12.1.0

exo: update for 12.1.0

kern: fix handling of is_aligned parameter in DevicePageTable

fs.mitm: ns registers program index map info, not am

fs.mitm: add OpenDataStorageWithProgramIndex support (theoretically, closes #1250)

erpt: fix 0x100 byte memory leak on creation of new report

build: use DWARFv4 explicitly for IDA compatibility with debug elfs

git subrepo push emummc ...

subrepo:
  subdir:   "emummc"
  merged:   "cbc294c3"
upstream:
  origin:   "https://github.com/m4xw/emuMMC"
  branch:   "develop"
  commit:   "cbc294c3"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

emummc: add custom ld/specs file

kern: implement improved [new page tables are zero] invariant

kern: fix missing peak set in KResourceLimit::SetLimitValue

kern: ensure InitArguments do not cross page boundaries

dns.mitm: fix wildcardcmp failure case (#1539)

reboot_to_payload: Use ams:bpc API to set payload, reboot safely and prevent usage on Mariko (#1543)

git subrepo push libraries ...

subrepo:
  subdir:   "libraries"
  merged:   "11ea38a7"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "11ea38a7"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

ams: bump version to 0.19.4

git subrepo pull emummc ...

subrepo:
  subdir:   "emummc"
  merged:   "219c723c"
upstream:
  origin:   "https://github.com/m4xw/emuMMC"
  branch:   "develop"
  commit:   "219c723c"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

kern: fix enormous whoops

sm: lighten abort restrictions on mitm handle acquisition (closes #1528)

kern: slightly improve genericity of debugger break event

mem: actually fully fix the heap bug, add comments for future self

mem: fix rare crash/logic error in heap allocation code

libstrat: fix override operator new to be noexcept (closes #1494)

git subrepo push libraries ...

subrepo:
  subdir:   "libraries"
  merged:   "b5b55f60"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "b5b55f60"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

sf/tipc: treat min/max as true min/max, rather than numeric

warmboot: remove superfluous firmware version check

docs: amend changelog