settings: Add a registry of settings

LoadString: Sanitize input

settings: Handle empty string, remove redundant category

settings: Rename Input to Controls, FS to DataStorage

settings: Fix Controls groups information

settings: Move use_docked_mode to System (again)

settings: Document

settings: Add type identification function

settings: Move registry into values

settings: Move global_reset_registry into values

settings: Separate AdvGraphics from Renderer

settings: More document

squash

settings: Use linkage object

uisettings: Move registry into settings

Probably wont build without

uisettings: Use settings linkage object

config: Load settings with a map

Uses the new all_settings vector to load settings.

qt-config: Rename settings category

qt config: Rename to read category

config: Read/write contols category with for_each

This is extremely limited due to the complexity of the Controls group,
but this handles the the settings that use the interface.

qt-config: Use new settings registry

qt-config: Read/write advgrphics

qt-config: Use settings linkage object

yuzu_cmd: Load setting off of vector

cmd-config: Finish settings rename

config: Read controls settings group with for_each

cmd/config: Move registry into values

cmd: Read adv graphics

cmd-config: Use settings linkage object