Slight improvements to readability.

Dropped suggestions for string_view (settings.h:101), pass by value
(settings.h:82), reverting double to a float (config.cpp:316), and other
smaller ones, some out of scope.

Addresses review feedback.

Co-authored-by: Ameer J <52414509+ameerj@users.noreply.github.com>

I must have been asleep or something. These need to be read with the new
ReadBasicSetting function.

Fixes Disgaea 6 Demo issues.

Also adds documentation for the ReadSetting function.

Address review comments.

Co-authored-by: Mai M. <mathew1800@gmail.com>

bcat: Fix settings access

telemetry_session: Fix settings accesses

So this is what I get for testing with the web service disabled.

touch_from_button: Fix settings access for clang

For simple primitive settings, moves their defaults and labels to
definition time.

Also fixes typo and clang-format

yuzu qt: config: Fix rng_seed

Creates a new BasicSettings class in common/settings, and forces setting
a default and label for each setting that uses it in common/settings.
Moves defaults and labels from both frontends into common settings.
Creates a helper function in each frontend to facillitate reading the
settings now with the new default and label properties.

Settings::Setting is also now a subclass of Settings::BasicSetting. Also
adds documentation for both Setting and BasicSetting.

Avoids double-setting defaults, and avoids potential accidents when
inconsistently setting the default on new settings.

Requires a default value when creating each per-game setting.

vulkan_device: Make device memory match the rest of the file

Match the style in the file.

astc: Various robustness enhancements for the gpu decoder

common: Replace common_sizes into user-literals

Removes common_sizes.h in favor of having `_KiB`, `_MiB`, `_GiB`, etc
user-literals within literals.h.

To keep the global namespace clean, users will have to use:

```
using namespace Common::Literals;
```

to access these literals.

general: Add missing #pragma once directives

* Add missing includes

* Add array

externals: Update fmt to 8.0.0

[audout] Implement GetAudioOutPlayedSampleCount

Also removes some deprecated API usages.

maxwell3d: Add missing return in default SizeInBytes() case

We were returning '1' in ComponentCount()'s default case but were
neglecting to do the same with SizeInBytes().

GPU: Implement a garbage collector for GPU Caches (project Reaper+)

Keeps us up to date with the latest major release.

Also allows compilers that support it to perform compile-time format
string checking.

bootmanager: Use std::stop_source for stopping emulation

Simple resizing of Per-Game configuration window and removal of useless Help question mark button in the title bar

common/detached_tasks: Wait for tasks before shutting down

input_common/mouse_input: Fix data race

npad: Fix data race when updating devices

Simple resizing of the Per-Game configuration window and removal of useless Help question mark button in the title bar

common: fs: Miscellaneous changes

service: spl: Implement general SPL service

service: time: Use GetFileRelative to get files within subdirectories

This provides a more concrete example of what a regular file is and isn't.

These enforce requiring the file to exist prior to opening.