kernel: Optimize GetHostThreadID

CMakeLists: Ensure proper numerusform tags are generated for pluralized translations

logging: Simplify and make thread-safe

If we don't set an explicit source and target language for the base
english translation, then we'll generate an incorrect number of
<numerusform> tags (which Transifex doesn't like).

settings: Amend language_index maximum setting range

The maximum is now 17 with the addition of Brazilian Portuguese

video_core: eliminate constant ternary

dynarmic: Update and enable DYNARMIC_IGNORE_ASSERTS

SPIR-V: Merge two ifs in EmitGetAttribute

applet_error: Fix 64-bit error code conversion

Replace QPoint with QPointF where applicable

Previously, floats were implicitly cast to integers

qt_software_keyboard: fix copy-paste error

`via_header_index` is already checked above, so it would never be true in this branch

Fix crash in logging in CreateStrayLayer

It was trying to log value of layer_id which is specifically known not to exist, potentially leading to segfault. Log display_id instead.

Fix check is thread current in GetThreadContext

Misplaced break made it only check for the first core.

kernel: Various improvements to scheduler

Fix LAN Play

decoders: Optimize memcpy for the other functions

threadsafe_queue: Fix deadlock

- This would have limited value, and would be a mess to handle properly.

This fixes a lost wakeup in SPSCQueue. If the reader is in just the right position, the writer's notification will be lost and this will be a problem if the writer then does something to wait on the reader.

This was discovered to affect my upcoming stacktrace PR. I don't think any performance decrease will be noticeable because an uncontended mutex is smart enough to skip the syscall. This PR might also resolve some rare deadlocks but I don't know of any examples.

This simplifies the logging system.

This also fixes some lost messages on startup.

The simplification is simple. I removed unused functions and moved most things in the .h to the .cpp. I replaced the unnecessary linked list with its contents laid out as three member variables. Anything that went through the linked list now directly accesses the backends. Generic functions are replaced with those for each specific use case and there aren't many. This change increases coupling but we gain back more KISS and encapsulation.

With those changes it was easy to make it thread-safe. I just removed the mutex and turned a boolean atomic. I was planning to use this thread-safety in my next PR about stacktraces. It was actually async-signal-safety at first but I ended up using a different approach. Anyway getting rid of the linked list is important for that because have the list of backends constantly changing complicates things.

The header "combaseapi.h" of mingw-w64 defines "interface" as "struct".

input_common: Disable sdl raw input mode