lmem: Implement UnitHeap, ExpHeap (#823) ...

* lmem: implement ExpHeap

* lmem: Implement Slab^H^H^H^HUnitHeap

ro: save 0x25000 while maintaining security improvements

ro: implement 9.1.0 security measures

boot: update to accurate as of 9.1.0

libstrat: fix unconverted _WITH_ASSERTs

ro: implement NRR signature checks

ams: revamp assertion system

fix building libstratosphere

kern: add KProcess members

kern: use TinyMT instead of mt19937_t

find -exec sed -i'' -e 's/2018-2019 Atmo/2018-2020 Atmo/g' {} +

svc: populate namespace

ams: use bitpack for api version

strat: use util::FourCC where relevant

fatal: include stack/tls in reports

cfg: Allow more flexible hbl configuration

sf: Allow for more than one process id holder (ugly)

random: use TinyMT instead of XorShift

sf: Improve class member function detection

git subrepo clone https://github.com/Atmosphere-NX/Atmosphere-libs libraries ...

subrepo:
  subdir:   "libraries"
  merged:   "07af583b"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "07af583b"
git-subrepo:
  version:  "0.4.0"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "5d6aba9"