Remove model handler locator / start copy

* Refactor model handler **! (HEMERA-3656)
* Start refactor move algorithms
* Initial work on copy / paste (HEMERA-3640)
Close to the end (HEMERA-3638)
Fix bug
Merge branch 'HEMERA-3638-copy-and-paste' into merge-copy

Conflicts:
	org.eclipse.bpmn2.modeler.core/src/org/eclipse/bpmn2/modeler/core/features/MoveFlowNodeFeature.java
fix imports after merge