Add ability to match multiple shows at once

[gabriel-stackhouse]

Rather than having to match each show individually, some may want to match multiple shows in one swoop. So, upon choosing a show, let the user select multiple shows (comma-separated), or choose 'all' for all shows.

Implement this similar to how seasons are chosen and iterated through.

[morpheus2n2]

I for one would love this option

[MattSidney]

Sounds great! would be good to be able to run at a library level (although 'all' would cover that)