Mk2 Expansion 1.7.26

-New Part: Shrouded Thermal Control System
-Part Rework: Hypersonic Nosecone
-Part Rework: Spadetail
-Hypersonic Cockpit and Hypersonic nosecone max temp increased
-Fixed engine FX, removes Aero FX/Engine FX interaction
-Tweaked Afterburn thrust curve
-'Vector' turbojet mass reduced
-'Wedge' Linear Aerospike mass reduced
-'Sledgehammer' Air-Augmented rocket thrust reduced
-Various part costs adjusted to be more in line with stock prices