DataBus: introduce SimpleRequestBroker & EA-60485 - assert: MessageBusImpl.checkNotDisposed
cleanup
IDEA-132867 Push dialog: display "force push" option always, just disable it if force push is not enabled in the settings + show a tooltip how to enable the option

* tooltips added;
* isPushAllowed changed, ability to provide protected target added;
* SimplePushAction removed;
* getPresentation added to PushTarget