Create model element handlers for allocation entries
Current situation
If any traversal over models with allocations is performed that queries the ModelElementHandlers, warnings are produced in the console.
Proposed solution
Create them for the different kinds of allocation entries (e.g., 1-to-1) delegating to the model element handlers of the source and target elements.
Test case.
- Switch to branch 3482 (af3 + kernel)
- Import the attached model, switch to the DSE perspective, and import the model into the DSE perspective. Note the many warnings in the console without the upcoming change.
- Close AF3 & Cherry-pick commit 060728ce
- Import the attached model, switch to the DSE perspective, and import the model into the DSE perspective. Warnings shall be gone.
(from redmine: issue id 3633, created on 2019-02-06, closed on 2019-03-11)