Orbital Survey Plus

[2.3.0 - 13 November 2016]
- Scan area is now scaled to project correctly onto a globe, eliminating distortion at high latitudes (exact poles still see some weird stuff)
- Found and fixed a bug causing constant re-processing of the resource overlay shroud and bogging down the game
- Fixed an error in maximum scan altitude calculation
- Retroactive scanning added: an attempt will be made to fill in gaps caused by scanning at high time warp
- Optimizations made to compensate for the increased processing necessary for retroactive scanning
- Overlay auto-refresh implemented: active overlays will now refresh for new scan data when the processing requirement is reasonable