* Convert all setting keys in settings.h into hana strings
* Derive libretro setting keys from common/settings.h hana strings
* settings.h: Reduce code repetition in key definitions via macro
* Implemented mechanism to pass our C++ setting keys to Android/Kotlin
None of the Android keys have been moved over as of this commit, this is just prep work
* jni_settings_keys.cpp.in: Removed redundant code
* Migrate (almost) all Android setting string keys over to SettingKeys
Also some slight cleanup
* Updated license headers
* Fixed top custom width erroneously being used in place of top custom height
* Migrate (probably) all setting string keys to Settings::QKeys
* Migrated several previously missed string keys to generated keys
* SettingKeys.kt: Visually seperate shared and Android-exclusive keys, similar to GenerateSettingKeys.cmake
* android: sdl2_config --> android_config
Not sure why these values are named this way. Hold-over from SDL2 frontend?
* android: Generate and validate default config.ini dynamically
* Settings: Assume C-style string keys by default
Relative to the previous commit, the following names have changed:
- Settings::Keys --> Settings::HKeys
- Settings::CKeys --> Settings::Keys
* default_ini.h: Fixed formatting warning
* Comment cleanup
* android: Fixed compilation failure due to incorrect namespace
* config.cpp: Use ASSERT_MSG instead of LOG_ERROR and ASSERT(false)
