Replaces every way of handling config for each frontend with SimpleIni. frontend_common's Config class is at the center where it saves and loads all of the cross-platform settings and provides a set of pure virtual functions for platform specific settings.
As a result of making config handling platform specific, several parts had to be moved to each platform's own config class or to other parts. Default keys were put in platform specific config classes and translatable strings for Qt were moved to shared_translation. Default hotkeys, default_theme, window geometry, and qt metatypes were moved to uisettings. Additionally, to reduce dependence on Qt, QStrings were converted to std::strings where applicable.
Now logging will start when the frontend starts like qt does. This also adjusts the share log button to follow where we share the current log if we just returned from a game or return the old log if we haven't started a game yet.
Emulation states are repeatedly checked by input and performance stats. During startup and shutdown, this could lead to a long halt on the UI thread because the call to IsRunning will be waiting on the emulation mutex to be unlocked. Using atomics should replace the existing functionality without causing problems.
Completely removes code related to parsing the settings file on the java side. Now all settings are accessed via NativeConfig.kt and config.cpp has been modified to be closer to the core counterpart. Since the core currently uses QSettings, we can't remove reliance from Wini yet. This also includes simplifications to each settings interface to get closer to native code and prepare for per-game settings.
This causes a couple of minor changes to directory initialization. We don't have a lengthy initialization step so we could spend less time creating state receivers and just run initialization on the main thread. We also don't have a situation where external storage will be a concern so checks are removed in favor of a binary check to see if initialization is ready.
This additionally removes the unused DoFrame callback.
