Deploy across an entire web cluster

Adds deploy, undeploy, and redeployAll to webapp cluster entities (DWAC and ControlledDWAC).

Also fixes some issues noticed in how tasks are tracked and displayed.
Do we really need the `@Effector` and `@EffectorParam` annotations here? We have them on the interface's method that this `@Override`s so that should be enough I'd have thought?