#128 - Refactor: groups constants
Merge remote-tracking branch 'origin/GH128-refactor-constants'

Conflicts:
	org.flowerplatform.flex_client.core/src/org/flowerplatform/flex_client/core/CorePlugin.as
	org.flowerplatform.flex_client.mindmap/src/org/flowerplatform/flex_client/mindmap/MindMapNodePropertiesConstants.as
	org.flowerplatform.flex_client.mindmap/src/org/flowerplatform/flex_client/mindmap/renderer/MindMapNodeRenderer.as
	org.flowerplatform.flex_client.web/src/org/flowerplatform/flex_client/web/WebPlugin.as
	org.flowerplatform.freeplane/src/org/flowerplatform/freeplane/controller/MindMapPropertiesProvider.java
	org.flowerplatform.freeplane/src/org/flowerplatform/freeplane/controller/MindMapPropertySetter.java
	org.flowerplatform.mindmap/src/org/flowerplatform/mindmap/MindMapNodePropertiesConstants.java
	org.flowerplatform.mindmap/src/org/flowerplatform/mindmap/MindMapPlugin.java