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

lib: simplify pragma macros

remove leftover debug print

libs: add ongoing work to facilitate hactool rewrite

libs: begin adding capacity for doing crypto on generic os (using externally-preset keys)

fs: add just in case bounds checking to linux/macos dirent read

add basic tests for os::Event/SystemEvent functionality

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

erpt: add automatic report cleanup mechanism on boot (closes #1795)

KThreadContext: Use El0PsrMask constant in GetUserContext

ams_mitm: update to use new NcaFileSystemDriver intf

crypto: fix asm constraints for memory comparison

fix SubStorage copy ctor/= op for new shared_ptr member

fs: add Sha256HashGenerator, LZ4 decompressor

fs: remove now unused StorageOption

fs: revise NcaFileSystemDriver for latest semantics

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.

kern: fix syntax in audit statement

lib: add missing semicolon

build: remove unnecessary g-dwarf4 flags

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

typofix: boogaloo: electric.