initial commit of spray/graphiti project for composite diagrams

...ompositediagram/diagram/CompositediagramModelService.java

...diagram/diagram/CompositediagramToolBehaviorProvider.java

...ram/diagram/CompositediagramToolBehaviorProviderBase.java

...m/features/CompositediagramAddAssemblyContextFeature.java

...atures/CompositediagramAddAssemblyContextFeatureBase.java

...eatures/CompositediagramAddCompositeComponentFeature.java

...res/CompositediagramAddCompositeComponentFeatureBase.java

...ompositediagram/features/CompositediagramCopyFeature.java

...sitediagram/features/CompositediagramCopyFeatureBase.java

...eatures/CompositediagramCreateAssemblyContextFeature.java

...res/CompositediagramCreateAssemblyContextFeatureBase.java

...ures/CompositediagramCreateCompositeComponentFeature.java

.../CompositediagramCreateCompositeComponentFeatureBase.java

...res/CompositediagramDirectEditAssemblyContextFeature.java

...CompositediagramDirectEditAssemblyContextFeatureBase.java

.../CompositediagramDirectEditCompositeComponentFeature.java

...positediagramDirectEditCompositeComponentFeatureBase.java

...eatures/CompositediagramLayoutAssemblyContextFeature.java

...res/CompositediagramLayoutAssemblyContextFeatureBase.java

...ures/CompositediagramLayoutCompositeComponentFeature.java