Added the following changes by KortexM:
- Ready for KSP 1.2 (recompiled, small changes to configs)
- Added Interstage Nodes (no trusses) to Fairings and Interstage Fairing, two connections possible on each node (up & down)
- A few code cleanups (foreach mostly)
- Fixed Fuel Crossfeed (be aware that flow to/from interstage nodes is affected too!)
- Fixed ghost nodes appearing when adding a new fairing base in the VAB/SPH
- Fixed blue ghost lines (invalid fairing outline) when having multiple fairing bases in VAB/SPH
- Fixed interstage nodes positions for Interstage Adapter when resized
- Some UI fixes
- Code cleanups (de-Linqed etc.)
- All other bugs/features untouched (hopefully..)