Disabling doesn't actually work

[jwetzell]

Seems my simple attempt to disable filters doesn't seem to work as the in/out of disabled filters in chain doesn't get "patched around" so if it's like input -> crop -> trim (disabled) -> output. This would error as the crop filter would have no output attached.

There are a lot of edge cases that start to crop up. I'm trying to sort through a solution for this not sure if you want to take that feature out until something that actually does work comes along.