VFR HUD Compass rework to industry standards

#### Issue details

The VFR HUD is supposed to be a quick-reference for critical in-flight data. The scrolling bar of numbers on top is very difficult to quickly interpret. That bar should be removed, and if heading data is so critical that it needs to be replaced, it should appear as something that comes from a proven instrument -- the directional gyroscope ("DG").


There's a reason just about every manned aircraft has one of these that looks the same. There's no need to re-invent the wheel here. Just use a similar concept. Even something looking roughly like a DG would be better than a scrolling bar of numbers at the top.

#### Version
All

#### Platform
[X] All

Start by locating the VFR HUD compass implementation in Mission Planner and review the existing heading display alongside the issue screenshots. Done means removing the scrolling numeric bar and replacing it with a recognizable directional-gyro-style compass that presents heading data clearly.

Written by the indexing model from the issue text.