Fix scaling issues when part is created

• KSP rescales the model object back to 1,1,1 on start, so don't use that for the model that gets scaled
• Some refactoring to consolidate property IDs
• rename some classes because I am indecisive
• Add and Get methods for MaterialPropertyCollection
• Make an attempt at a scale culling fix

Distribution/GameData/ConformalDecals/Parts/decal-blank.cfg

@@ -47,6 +47,7 @@ PART
 
     decalFront = Decal-Front
     decalBack = Decal-Back
+    decalModel = Decal-Model
 
     useBaseNormal = false
 

Distribution/GameData/ConformalDecals/Parts/decal-flag.cfg

@@ -48,6 +48,7 @@ PART
 
     decalFront = Decal-Front
     decalBack = Decal-Back
+    decalModel = Decal-Model
 
     useBaseNormal = true
   }