Add feature to automatically clean up media library

[robinp7720]

Having an automatic method of sorting/cleaning up a media library would be incredibly beneficial.
Ideally, items should be moved to the correct location after they have been indexed, but there should also be a rest endpoint to execute a cleanup manually.

Options that should be available for cleaning up series libraries:

• Group by (multiple may be possible, order also matters):
  • Network
  • Genre
  • Status (Ended/Continuing)
  • airsDayOfWeek
• Separate directories for seasons

Options that should be available for cleaning up movie libraries:

• Group by (multiple may be possible, order also matters):
  • Release year
  • Genre
  • Original Language