Editor Camera Orientation tool

[MickHarrigan]

Add in a tool that in the UI that shows the current rotation of the editor camera, akin to that of most other editors.

Examples:
Godot

Blender

This should both show the current rotation as well as be interact-able such that the location/orientation of the editor camera can be changed.

[naomijub]

I think we can tweak gizmos to behave in this way.