Add Cemu to get_setting_value and set_setting_value
Update Cemu prepare_emulator content
Prepare and add savestate_auto_load and savestate_auto_save presets
Improve handling of internal system names
Add internal->user readable system name translation
Disable PS4 in es_systems
Improve get_setting_value handling of missing setting name in section
Add systems to borders, widescreen and nintendo_button_layout presets