Allow regex renames

[gazpachoking]

I'd like the option to rename using regex substitution as well as with autodetected season/episode numbers. This way relevant parts (e.g. titles) can be kept, as well as supporting more unorthodox original numbering schemes. I'll probably put together a pull request to support this in the next few days.

[marsjaninzmarsa]

+1

[nhoad]

Starting to think @gazpachoking isn't going to submit the pull request

[gazpachoking]

Hehe, I saw this update in my feed and said "what the heck is batchrenamer?" Yeah, don't count on me for this one anymore. 😉