Change F5 to be more customizable

In addition to the normal cycling of F5 to change POV, allow F5+movement key (WASD) to change the view to be from that direction. Example, F5+S is from the back.

If you press F5+jump, then you get a top-down overhead view.

If you press F5+sneak, the view goes back to 1st person. If you press F5+run, you get the bottom-up view (not really useful unless you're flying, but still).