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

emummc: fix for svcQueryIoMapping abi change

ncm/build dist: minor fixes

ams: fix boot sysmodule/kernel for 10.0.0

ncm: update to 10.0.0 (#879)

creport: update for 10.0.0

ldr: update 10.0.0 conditionals

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

os: refactor/rewrite entire namespace.

ncm: use static memory pools for different allocations

stratosphere: fix building with latest libnx

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.mitm: use new namespace types for saves

stratosphere: fix building with latest libnx

ams.mitm: greatly reduce memory requirements to build romfs

stratosphere-ldr: fix code mount name

ams: finish stdio -> fs bindings for stratosphere

loader: refactor to use fs bindings

ldr: optimize memory usage for tracking system programs

stratosphere-except-ldr: use fs bindings (this temporarily breaks loader)

fusee: update fss0 header

fatal: use fs bindings

creport: minor reformatting/fixes