More Preferences refactoring
More Preferences refactoring. Added popup dialog as alternative to
List-Detail panel
Bug 420947 - delete Data Association visuals and DI element.
Merge remote-tracking branch 'upstream/master' into fixflow-kepler

Conflicts:
	org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/preferences/Bpmn2Preferences.java