Allowing nodes to hide their previews through "NodeModel.ShouldDisplayPreviewCore()"
Merge branch 'master' into BubbleBurst
Merge branch 'master' into BubbleBurst
Removed unused constant values from Configuration class
Implemented "FrozenResources" to store brushes that will never change
Merge branch 'master' into BubbleBurst
Merge pull request #1635 from Benglin/BubbleBurst

Improved the way node classes hide their preview icons