BZ 1069913 - Designer doesn't save Meessage event attribute - MessageRef in lane

Conflicts:
	jbpm-designer-backend/src/main/java/org/jbpm/designer/bpmn2/impl/Bpmn2JsonUnmarshaller.java
BZ 1073654 - Process can not be reopened in Designer if it is imported containing missing data types
temporary disabling transformations on data input/output associations
BZ 1075955 - Designer displays just empty page on EWS