correct spell of ResourceLoader (was: RecourceLoader)
introduced namespaces Limaki.Drawing.XwtBackend and Limaki.View.XwtBackend | replaced GraphSceneContextLayer with XwtGraphSceneLayer
renames of GraphEntityTransformers
refactored DependencyVisitor to have a common Source/Sink-Dependency-Method
introduced VisualThingsResourceLoader to encapsulate Limada.Model