Minor header fixes to reduce parsing issues with Clang (#1700) ...

* Work around Clang's incomplete C++20 support for omitting typename

* vapours: fix Clang error about missing return in constexpr function

* stratosphere: fix call to non-constexpr strlen in constexpr function

strlen being constexpr is a non-compliant GCC extension; Clang
explicitly rejects it: https://reviews.llvm.org/D23692

* stratosphere: add a bunch of missing override specifiers

* stratosphere: work around Clang consteval bug

Minimal example: https://godbolt.org/z/MoM64v93M

The issue seems to be that Clang does not consider f(x) to be a
constant expression if x comes from a template argument that isn't
a non-type auto template argument (???)

We can work around this by relaxing GetMessageHeaderForCheck (by using
constexpr instead of consteval). This produces no functional changes
because the result of GetMessageHeaderForCheck() is assigned to a
constexpr variable, so the result is guaranteed to be computed
at compile-time.

* stratosphere: fix missing require clauses in definitions

GCC not requiring the require clauses to be repeated for member
definitions is actually a compiler bug:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96830

Clang rejects declarations with missing require clauses.

* Fix ALWAYS_INLINE_LAMBDA and parameter list relative order

While GCC doesn't seem to care about the position of the always_inline
attribute relative to the parameter list, Clang is very picky
and requires the attribute to appear after the parameter list
(and before a trailing return type)

* stratosphere: fix static constexpr member variable with incomplete type

GCC accepts this for some reason (because of the lambda?) but Clang
correctly rejects this.

ams: overhaul fs.mitm romfs ownership, bump to 1.2.4

dmnt: enable experimental standalone usage of gdbstub, while starlink is in dev

ams.mitm: more romfs building space/time tradeoffs. ...

This is needed for Animal Crossing 2.0.0, which has >99000 fucking files.

We now do several passes over dir/file tables instead of one pass,
doing entire hash tables before we touch dir/file tables. Thus we
no longer need to simultaneously allocate hash table and dir/file table space.

In addition, we now do repeated passes building a segment of hash tables
at a time, when insufficient memory is available. Similar is also now the
case for file/dir tables, we try 0x40000 work buffer and divide by 2
until we successfully alloc. We don't allow a work buffer <0x4000, for
write/perf reasons. If a game triggers that, let me know I guess.

Hard to imagine a worse torture-test for this code than animal crossing.

ams: improve offsetof style consistency

sf: prevent emitting mitm/defer code unless server in process supports it

ams: allow bootloader to merely approximate correct target firmware

strat: use m_ for member variables

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

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

strat: always use explicit result namespacing

settings: implement KeyValueStore (#1659) ...

* settings: implement KeyValueStore and dependencies

* settings: update KeyValueStore for recent refactoring

* settings: address feedback

ams.mitm: avoid using std::unordered_map, it manifests exception code

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

strat: build sysmodules with -Wextra/-Werror

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

strat: automatic program id detection

stratosphere: use SdkMutex/SdkRecursiveMutex over Mutex

fs.mitm: fix memory leak in romfs build (closes #1031)

set.mitm: pointer buffer size was increased to 0x200 in 13.0.0

LogManager: implement system module, client api, logging api (#1617) ...

Some notes:

* Unless `atmosphere!enable_log_manager` is true, Nintendo's log manager will be used instead.
  * This prevents paying memory costs for LM when not enabling logging.
  * To facilitate this, Atmosphere's log manager has a different program id from Nintendo's.
  * `atmosphere!enable_htc` implies `atmosphere!enable_log_manager`.
* LogManager logs to tma, and the SD card (if `lm!enable_sd_card_logging` is true, which it is by default).
* Binary logs are saved to `lm!sd_card_log_output_directory`, which is `atmosphere/binlogs` by default.

fusee: fix buildsystem, rename secondary -> package3

ams-1.0.0: meso no longer optional, remove conditional logic

ams: replace sept with tsec firmware (#1594) ...

* ams: replace sept with tsec firmware

This replaces sept with a custom tsec key derivation firmware.

NOTE: This does not use any TSEC exploits whatsoever; it is a well-signed
TSEC binary assembled with envyas and signed with the real cauth key.

For more details, contact SciresM#0524.

* fusee: only set SBK if it's readable

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

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

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