[Feature Request] Ability to Filter on Non-Tag Columns

[Chirishman]

I'd like to be able to filter on non-tag columns. This is an ask in two parts.

1. I'd like to be able to filter on Rating to drop, for example any items I've rated as one-star from COPS
2. I use the FanFicFare a bunch and it stores/tracks read/unread in a custom column and not as a tag and so I've standardized on that in all of my libraries. I'd like the ability to filter Read/Unread on an arbitrary column.

[mikespub]

Included in release 1.4.2 at https://github.com/mikespub-org/seblucas-cops with bootstrap2 template

[Chirishman]

Included in release 1.4.2 at https://github.com/mikespub-org/seblucas-cops with bootstrap2 template

Thanks! Having some issues trying to switch to your fork though. I raised an issue: mikespub-org/issues/21