The settings the game saves itself, the quiz settings and now fullscreen, move
to settings.cfg (settings_debug.cfg in debug mode).
config.ini in the same folder is edited by hand: the server to start with, the
API password and debug mode. The game writes it with everything commented out
when it is missing and never changes it after that. IniFile reads it: plain
key = value lines, whole-line # or ; comments and optional quotes.
The quiz card's settings are saved to quiz_settings.cfg in OS.get_config_dir()
on every change and loaded at start. Debug builds use their own file, and
MUSICPLAYER_CONFIG_DIR moves the file elsewhere so tests never touch it.
Count plays in statistics and Prefer less played soundtracks are not saved and
move from the quiz card to the Settings popup.
Sansan