Builtin events for some dash DAQ components

[Bachibouzouk]

It would be nice to have more refined callbacks for the DashDaq components, and to have click for all of them.

Some ideas :

1. release (like click but only fires when the mouse is released)
2. double_click
3. pressed (like click but only when the mouse is pressed)
4. changed_ui vs changed_programatically to distinguish between user input or other callbacks

More ideas can be found in PyQt4/5 QtCore

Maybe this is what the SetProps attribute is for?