Added place holder methods

Added a place holder method which should be written to clean file names, for example spaces which have been encoded as %20 could be replaced with hyphens.
Modified method name

clear_file_name > clean_file_name
Basic clean file name function
Merge remote-tracking branch 'upstream/master'

Basic clean file name function
Latest versions, includes id3_no_agenda and configuration tweaks to prevent errors running set_id3.