Allow re-ordering of actions

This allows the Actions on a Form Processor to be moved up and down to change the order the actions are executed.

This is often important because one action may depend on the output of another; so it makes it difficult if you accidentally put things in in the wrong order; or having made a Form Processor you now need to add an action in somewhere other than at the end.

It's a small patch to the angular files that simply add Move up and Move down buttons to each Action.