BZ-1001673: using forceclose in order to avoid confirmation after a delete operation
BZ-991058: cleaning up the code by removing duplicate class from jbpm-flow
(cherry picked from commit d75d43544a073b82d386e3ffbdcec52e2d92ec1c)
fix for failing tests
BZ 1035442 -  Unsaved changes warning is shown just the first time
BZ 1036124 - Designer delete a task even if only boundary event was selected