Program output and media formats update

• Reformat all code.
• Remove Python 2 support.
• Simplify Readme.
• Fix some optional media formats for output and update dependencies.
• Adjust program output:
  • Print separator only between each file
  • Print in bold the action (rip, skip, etc.)
  • Always print [ index/total ] when ripping multiple tracks, even for skipped ones
  • Be more concise for file information and use a list for all items
  • Do not print debug statements (loading, getting, etc.)