os: update os namespace for 15.0.0, loader/ro: update to use csrng, spl: bump max sessions

ro/os: use os primitives for MapProcessCodeMemory

ams: globally prefer R_RETURN to return for ams::Result

ams: use R_SUCCEED, R_THROW globally

ams: support building unit test programs on windows/linux/macos

Integrate new result macros. (#1780) ...

* result: try out some experimental shenanigans

* result: sketch out some more shenanigans

* result: see what it looks like to convert kernel to use result conds instead of guards

* make rest of kernel use experimental new macro-ing

loader: refactor ro manager/improve accuracy

strat: use m_ for member variables

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

strat: refactor address taking of form &var[...]

strat: use ams::Main() instead of main(argc, argv)

strat: build sysmodules with -Wextra/-Werror

svc: refactor/rename MemoryInfo fields

ro: double whoops

ro/dmnt: fix process address space detection

strat: remove map namespace, svc: add address space defs

strat: use sf::NativeHandle for ipc templating

strat: use svc:: over ::svc

ams: the copyright^H^H^H^H^H^H^Hmplex plane is the algebraic closure of the reals

os: remove ManagedHandle, refactor to use NativeHandle typename

ro: simplify program id logic

strat: automatic program id detection

stratosphere: grant access to SynchronizePreemptionState

strat: no longer materially constrained by sm session limit

result: always prefer diag::Abort to fatal

strat: update for revised libnx weak alloc funcs

ro: reduce memory usage by excising (unused) std::malloc

ro: update for new sf semantics

strat: add new npdm field

strat: use 39-bit address space when available (new loader extension)