HID: Update the HID service to match more closely to switchbrew part 1

Kernel Rework: Refactor KEvent/KReadableEvent/KWritableEvent

k_priority_queue: Minor cleanup

IApplicationFunctions: Implement GetHealthWarningDisappearedSystemEvent

video_core: host_shaders: Don't pass --quiet to glslangValidator if unavailable

k_affinity_mask: Avoid implicit truncation to bool

This can cause compiler warnings. Instead, we can explicitly add a
boolean expression around it to naturally turn the result into a bool.

Given these are only used as function existence checks, we can simplify
some usages of declval, given they aren't particularly useful here.

Reduces a few template instantiations, which at most reduces compile
times a tiny bit.

We can make use of the _t variants of the templates to cut down on a
little bit of verbosity.

An identifier containing a starting underscore followed by a capital
letter is reserved by the standard. It's trivial to avoid this by moving
the underscore to the end of the identifier.

While the likelihood of clashing here being minimal, we can turn a
"should not break" scenario into a definitive "will not break" one, so
why not?.

key_manager: Create the keys directory if it does not exist

config: Always update handheld config

audren: Disable reverb for the time being

kernel: Rewrite resource limit to be more accurate

acc: Fix error when second user is selected

Avoid overwriting username

settings: Log the cache, config and mod load directories