Playlist transfer tool bugs

[JeffreyGaydos]

Schema Changes:

• Removed PK in order to allow NULL in TrackID and TrackOrder
  • Replaced by 2 unique constraints: (PlaylistID, TrackID), (PlaylistID, TrackOrder)
  • Added Surrogate identity column that is completely unused outside of a key for EF
• [x] TODO: Update Schema Readme

Parsing Changes

• Support for m3u8 files
• More fallbacks
• Better matching
• Better merge operations
• Export only
• Only update playlists if the file was modified after the date we last updated the database side of things
  • Note that setting the value to the last modified date somehow resulted in repeated ingestions.
  • We were adding the exact last edited date to the database and some kind of rounding made it always insert as 0.1 seconds before the last modified date, so it looked like we always had something to update
• [x] TODO: Update Playlist Transfer Tool Readme

TODO

• [x] See if your recently converted Groove playlist can run in groove without all the proper data
  • [x] Also determine if it can run with less data, and if it can, make that a fallback to just throw the path in the file with absolute path prefix as necessary
• [x] Add support for .m3u8 files
  • [x] They have a new extension
  • [x] They have a new comment for the name of the file (so ignore any line that starts with #)
• [x] Test
  • [x] Groove to Samsung
  • [x] Samsung (not found) to Samsung
  • [x] Groove (not found) to Groove
  • [x] Export Only Groove (with not founds and founds)
  • [x] Export Only Samsun (with not founds and founds)