Quick fix for 0.21 compatibility.

It looks like CelestialBody.GetRelativeSurfacePosition is broken and
returns wrong values.
Added modular light arrays.

Now it is possible to configre light arrays in a config file and by
creating an implementation of ILightArray new lights can be easily
added.
Merge branch 'master' into develop

Conflicts:
	PAPIPlugin/PAPIAddon.cs
	PAPIPlugin/PAPIArray.cs
Merge pull request #2 from asarium/develop

Modular light arrays.