[FEAT] Ensure edges don't overlap shapes

[tbouffard]

Is your feature request related to a problem? Please describe.
In some complex layout, the edges overlap the shapes, which makes the diagram hard to read.

Example with the "Repair Example" generated after performing Process Discovery.

Describe the solution you'd like
Find a way to ensure that edges don't overlap edges.
#58 may help.

[NourEldin-Ali]

I found some issues with the overlap; perhaps this example can help you during the testing of your solution. The following table illustrates the BPMN generated by this tool and what I would prefer as a result (though other solutions could be acceptable as well).

ID	Layout using this tool	Preferred Solution
M1
M4
S1
S2
S7
S8

You can find all the BPMN files of the model here. The file names are listed by ID in the table below.
bpmn_model.zip

Note: the screenshots were done with bpmn-layout-generators v0.1.4.
Some improvements are available in v0.2.0, but don't cover everything. See https://github.com/process-analytics/bpmn-layout-generators/releases/tag/v0.2.0