R1:4c97d88aa4b3

Allow Almanac bindings to be disabled and unused interfaces to be removed

Summary:
Fixes T9762. Ref T10246.

**Disabling Bindings**: Previously, there was no formal way to disable bindings. The internal callers sometimes check some informal property on the binding, but this is a common need and deserves first-class support in the UI. Allow bindings to be disabled.

**Deleting Interfaces**: Previously, you could not delete interfaces. Now, you can delete unused interfaces.

Also some minor cleanup and…