Fixes

• fixed ~/.config/emptty being started twice, if Selection=true
• fixed manual page (typos, missing informations)

Features

• added -u/--default-user argument to allow preselect user on startup
• added -a/--autologin argument to allow autologin of default user, if following argument is set, it's considered as autologin session
• added -c/--config argument to allow different path to config file
• added -i/--ignore-config argument to disable loading config from file
• added SESSION_ERROR_LOGGING and SESSION_ERROR_LOGGING_FILE for logging of stderr from Xorg/Wayland session