Updates for Kethane 0.9, and dropping ORS dependency

The SCAN/SCANsat repo isn't up to date with yours, so it might be best to put this all here.

This updates SCANsatKethane to work with Kethane v0.9.

It also drops the hard-link to ORS, allowing us to stop distributing the ORS plugin.

The required ORS method (there is only 1) is assigned through reflection. ORS will need to be updated before this actually works, but that shouldn't be a problem. Older copies of ORS won't affect the core SCANsat functionality, or Kethane overlays, they will only prevent ORS overlays.

There are a few other minor tweaks and the changelog has been updated.