SCANsat [v7.0] release candidate 1

This is a first attempt at adding generic resource overlays.

As always, please delete existing SCANsat and SCANsatRPM folders. This should not result in the loss of any data, but back up your persistent.sfs to be sure!

The following fixes since RC0 are implemented:

• Big map should no longer break if no ORS resources are installed
• Switching from a high-number ORS resource to Kethane should not break the big map
• Incomplete big map should render properly
• Spottiness of resource scanners may be improved, it's hard to say, maybe ok up to 100-1000X timewarp
• Setting menu buttons don't change color anymore

This release adds the changes in #36:

For now, this means supporting:

• Open Resource System resources, including:
  • Uranium
  • Thorium
  • Alumina
  • Water

Right now, the following are partially implemented:

• Kethane resources:
  • Ore
  • Kethane

An image gallery to see examples of this can be found here.