[DMN Editor] Input Data typeRef

The Input Data nodes specifies the datatype via typeRef attribute. Allowed are simple datatypes, enumerations of allowed values and complex data types like Person.

During work on this were added typeRef selection widgets for three DMN nodes: BKM, Decision, and Input. These selection widgets offer BuiltInTypes, data types of project, editor for allowed values (enumerations).

Acceptance test

• Load dmn from other tool, check data types recognized appropriately, can be edited, saved, reopened
• Create new dmn, define different data types for different nodes, save, reopen, check values preserved