Fixes to Compile:
- ScaleType now uses a List<ScaleType> for _scaleTypes and AllScaleTypes instead of an array, so that LINQ and friends can be used
- Scale_Editor/Editor.cs had two missing includes: one to use KSPAPIExtensions and one to include Linq's extensions to IEnumerable like Select
- Updated Scale_Editor/ScaleDatabase.cs to compile with the aforementioned changes