Version 1.0

Version 1.0
       - Reordered, grouped, renamed command functions to the command name
       - Added function documentation
       - Fixed a bug in the set-<field> commands
       - The playing file is displayed with a "N O W   P L A Y I N G" notice
       - Added better filtering options for ratings:

         Comparison operator   Filter command
         <                     lt
         <=                    le
         =                     eq
         >=                    ge
         >                     gt