Add a way to create a header template - 45782

We are working to standardize our forms so they all appear the same way. To that end, we are creating letterhead to go at the top of each form. Right now, we are reliant on each individual user to add that letterhead to each form they create. It would be nice if we had an administrative button to click, maybe under the Apps section or Advanced Tools, that would allow us to assign a header image for all forms within a selection. It would be nice, too, if we could have different headers per environment.