ams: centralize system thread definitions

sf: properly support preservation of inline context

hos: change initialization API ...

This was needed to make stratosphere buildable with debugging on.

os:: assertions rely on GetCurrentThread() working, and this requires
the global os resource manager to be constructed. However, __appInit executes
before global constructors. We now require that hos::InitializeForStratosphere()
be called before anything else is done. This initializes the os resource manager,
sets the hos version for libnx, and may do more things in the future.

TODO: Consider replacing __appInit/__appExit with ams:: namespace functions in general,
and wrap them so that we guarantee hos::InitializeForStratosphere is called first, and
generally ensure a consistent stratosphere environment.

pgl: Reimplement the pgl sysmodule (#896) ...

* pgl: add skeleton folder to stratosphere

* pgl: Add service interface for IShellInterface

* pgl: begin skeletoning shell service, implement two commands.

* pgl: Implement three more commands.

* pgl: implement bool tracking commands

* pgl: Implement TriggerApplicationSnapShotDumper

* pgl: implement InitializeProcessControlTask

* pgl: Implement pgl::srv::Initialize

* pgl: Implement main()

* pgl: Implement (Get)ShellEventObserver

* pgl: implement LaunchProgramFromHost, GetHostContentMetaInfo

* pgl: Implement ProcessControlTask

* settings: fix duplicate object name

* pgl: fix minor bugs in impl

pgl: update with client C++ bindings

pgl: skeleton api

ams: fix boot sysmodule/kernel for 10.0.0

ncm: update to 10.0.0 (#879)

pm: Update to support 10.0.0

loader: update for 10.0.0

loader: update anti-downgrade tables for 10.0.0

hos::Version: rename enum members

erpt: reimplement the sysmodule (#875) ...

* erpt: reimplement the sysmodule

* fatal: update for latest bindings

* erpt: amend logic for culling orphan attachments

erpt: include all known types/categories in autogen

erpt: identify flags in autogen

erpt: tweak autogen

erpt: add ids (and autogeneration tool)

os: refactor/rewrite entire namespace.

fs: Implement AesXtsStorage

fs: add AesCtrStorage

fs: implement PooledBuffer

fs: implement system heap

fssystem: add RomFsFileSystem

NCM client implementation (#858) ...

* ncm: Implement InstallTaskDataBase and FileInstallTaskData

* ncm: minor bugfixes

* ncm: Implemented MemoryInstallTaskData

* ncm: more std

* ncm: begin implementing install task base

* ncm: move protected funcs

* ncm: fix recursive include

* ncm: more install task progress

* ncm install task: implement IncrementProgress and update UpdateThroughputMeasurement

* ncm: more work

* ncm client: more progress

* ncm client: more progress

* ncm client: finish implementing GetContentMetaInfoList

* ncm client: more progress

* ncm client: finished InstallTaskBase

* ncm client: implement PackageInstallTaskBase

* ncm client: fixes

* ncm: improve accuracy

* ncm client: implement PackageInstallTask

* ncm client: implement PackageSystemUpdateTask

* ncm client: minor name tweaks

* ncm client: implement SubmissionPackageInstallTask

* ncm client: add missing this to SubmissionPackageInstallTask

* ncm client: add missing nullptr check to SubmissionPackageInstallTask destructor

* ncm client: SubmissionPackageInstallTask fixes

* ncm: fix forward declarations

* ncm client: added simplified funcs

* ncm: cleanup client code

* ncm: fix bug introduced by cleanup

* ncm: fix typo

* ncm: implement correct ReadVariationContentMetaInfoList behavior

* ncm: correct InstallContentMetaWriter ctor

* ncm: correct conversion of content meta header types

Co-authored-by: Michael Scire <SciresM@gmail.com>

sf: fix OutArray/InArray constructors to behave as expected

nim: add DestroySystemUpdateTask/ListSystemUpdateTask (#863)

updater: improve api

ncm: use static memory pools for different allocations

mem: implement most of StandardAllocator (#860) ...

This was tested using `https://github.com/node-dot-cpp/alloc-test` plus a few other by-hand tests.

It seems to work for the case we care about (sysmodules without thread cache-ing).

External users are advised to build with assertions on and contact SciresM if you find issues.

This is a lot of code to have gotten right in one go, and it was written mostly after midnight while sick, so there are probably un-noticed issues.

fs: add MountImageDirectory