Filter out and translate invalid sockopt names.

-Implement GetSockOpt / SetSockOpt
-Fix bug in RecvFrom where sending from localhost
 does not fill in src_addr/src_addr_len on Linux

Compilation fix

Fix Qt string encode problem on Windows

Remove unnecessary const & replace pointer with reference

hid: implement accelerometer and gyroscope back-end

DSP: Implement audio codecs (PCM8, PCM16, ADPCM)

Immediate-mode improvements

This partially fixes Etrian Odyssey IV.

Our code did not handle this well, causing random crashes in some
situations.

fix SDL2 detection for Visual

Respect vs output map

archive_extsavedata: Fix member initialization order

armstate: Correct FIQ register banking

FIQ has seven banked registers (R8 to R14), not two.

soc_u: Get rid of explicit delete and new

core: Mark some helper functions as constexpr

shared appears in the initializer list before mount_point

HLE/FS: Fixed many corner cases in our file handling

This allows Fire Emblem to boot again.

Fix missing header

This fixes a regression.

Format information is currently only implemented for the ExtSaveData, SharedExtSaveData and SaveData archives, the information is stored in a file alongside the root folder of the archive.