fssystem: revise allocator logic for latest semantics

fssrv: flesh out the program registry

fssrv: skeleton more program registry logic

fssrv: add skeleton getters for service object sf::SharedPointers

fs: allocations with mutex held must be unsafe

fs: implement newer allocator templates

fssrv: skeleton server manager setup/registration

fssrv: add placeholder for ipc interface

fs: add skeleton dir for sysmodule code ...

Please note this isn't likely to immediately be the active ams project.

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

ams: first attempt at 13.2.1 support

ams: deduplicate static initialization logic

sf/cmif: optimize dispatch table walk to use binary search over linear search

ams/hos: add enum support for 13.2.0

sm/tipc: ensure technical-correctness of sins (no page cost)

sm: save 0x5000 of memory by sinning

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

spl: fix legacy physical keyslot compatibility

kern/test: add wip qemu-virt board support to mesosphere

ams: improve offsetof style consistency

constexpr: resign ourselves to gcc dropping void -> T support

tipc: implement special-case templating used by 13.0.0 pgl

tipc: enable named-thread dispatch

boot: update for 13.0.0/aula parameter changes (closes #1477)

powctl: integrate 13.0.0 changes (aula params not done yet)

strat: fix some mitm server management logic

tipc/sm: update more fully for 13.0.0 changes

tipc: add additional logic from 13.0.0