ams: mark ams::Result [[nodiscard]] (partially complete). ...

NOTE: This work is not yet fully complete; kernel is done, but
it was taking an exceedingly long time to get through libstratosphere.
Thus, I've temporarily added -Wno-error=unused-result for libstratosphere/stratosphere.

All warnings should be fixed to do the same thing Nintendo does as relevant, but this
is taking a phenomenally long time and is not actually the most important work to do,
so it can be put off for some time to prioritize other tasks for 21.0.0 support.

build: portability fixes ...

- Invoke Python scripts with `python3` if `python` is not available.

  Despite SciresM preferring Python 2, the scripts used in the build all
  worked in Python 3 already, so this is just a Makefile change.

- Export `MAKE` to work around a GNU bug.

  See the comment for details.

- `rmdir --ignore-fail-on-non-empty` -> `rmdir 2>/dev/null`

  macOS `rmdir` doesn't support `--ignore-fail-on-non-empty`.

  This is a slight downgrade in functionality, because now we ignore all
  errors from `rmdir` rather than just 'Directory not empty'.  I could
  have avoided this with a more complicated fix, but the benefit strikes
  me as not worth the complexity.  Let me know if you disagree.

- Append `$(DEVKITPRO)/tools/bin/` to `$PATH` when invoking
  `build_romfs`.

  This avoids the need to add devkitPro directories to `$PATH` when
  building Atmosphere.

  If you already have `build_romfs` in your PATH, then that will still
  take precedence.  (This seemed like the nicer option, though I don't
  have strong opinions.)

ams: build with -std=gnu++23

erpt: begin SubmitFsinfo (SubmitMmcDetailInfo)

windows: disable -fdata-sections ...

This causes all data to be emitted as .data$*. This breaks fzero-initialized-in-bss,
because linker puts stuff in .data even when it's all-zero and should end up in .bss.

windows: add brave new mingw compat hook for gcc 12.2.0+

strat: fix linux clang build

strat: fix clang build

kern: good night sweet prince

windows: link libgcc/libstdc++ statically

symbols: use same strategy on windows as on macOS

use cxxabi for demangling on linux/windows

abort/error: print backtrace, abuse templates, overhaul result/diag (macos not done yet)

libs: add ongoing work to facilitate hactool rewrite

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

build: remove unnecessary g-dwarf4 flags

ams: update for awareness of architecture revision

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

ams-libs: move -Wno-invalid-offsetof to cxxflags, not cflags

ams-libs: use nintendo_nx identifier for source file compat bpmp<->ccplex

ams: improve offsetof style consistency

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

strat: build sysmodules with -Wextra/-Werror

fusee_cpp: implement mtc erista patram writes

fusee_cpp: tweaks, now completes SecureInitialize on hardware

fusee-cpp: add basic structural stubs

build: use DWARFv4 explicitly for IDA compatibility with debug elfs

exo: revert section sorting

exo: sort sections by alignment

sm: update to excise unnecessary library code