#179 enable title changing (add or edit feature)
#179 provide constants for title values
#179 provide unit test for FeatureDefinitionDialog
#179 extend test cases with integration test
#179 rework commit f01c187
#178 implement input verification when Cancel button was clicked
#178 change existing tests. Input verification now happens when clicking OK button.
#178 extend usage of existing method
#178 rework commit 1890878