Add GeodesicGrid class
MapManager object started in flight, tracking station and main menu
The main menu scene is LOADING when it first starts
Construct grid mesh on start
Reverse triangle indices (and remove reverse call)
MapManager.cs -> MapOverlay.cs
setUpMesh is private
Show grid in map view
Use instance reference
Add getParentDistance function
Add Cell constructor for inverting GetHashCode
Skunky preview