Switch Distant Object Enhancement to KerbalStuff

This way it should pick up the new 0.90 support, and any future updates as well
Update for KerbalKonstructs 0.6.7

* Different zip layout (no GameData folder at top level)
* No .version file included (but that's OK, kerbalstuff provides version info anyway)
Merge pull request #249 from puetzk/master

Switch Distant Object Enhancement to KerbalStuff