fix path encoding on windows, fix quoted executebuiltin parameters not escaped, add stricter triggering of library scan & clean based on file type, add options to update & clean library on startup, add options to export nfo files

fixed: addon not able to handle paths with accents on windows
fixed: quote executebuiltin parameters
added stricter triggering of library scan & clean based on file type
added options for updating library on startup
added option for cleaning library on startup
added options for exporting .nfo files