Emit event when action is started (e.g. modal is opened) and separate action-executed to action-done and action-canceled

[webard]

Can be used to hide some floated elements, or catching when users starts doing something and when his ended operation.

Nova.$emit('action-modal-started') is fired when user clicked on action
Nova.$emit('action-modal-done') is fired when user clicked Run action
Nova.$emit('action-modal-canceled') is fired when user clicked Cancel in modal