Handle sequence-like ids as episodes

Both
- title: '[Commie] Chihayafuru - 02 [92F57247].mkv'
- title: '[Commie] Chihayafuru 2 x 21 [6AE6DC66].mkv'
get parsed correctly, as s01e02 and s02e21 respectively. Probably
breaks lots of things.
Note: 2 - 21 is not correctly parsed, but this isn't directly related.