[bz4591526] Add ability to specify a different binder from the view default

[add0n]

In addition to being able to specify a different view template from the default (the action name), we'd like to be able to specify a different binder as well, in the case where we'd like to share a view template between two different actions, but with different bindings.

[caridy]

ops, I didn't notice this open issue before making the pull request. Anyway, here is the pull:

#182

[caridy]

This is now solved for ac.done and ac.composite.done as well.