Opportunity for code cleanup: Remove deprecated methods registerChild

[mhdirkse]

Describe the issue
The Frank!Doc is quite complicated. One of the reasons has to do with method registerChild. This method has multiple overloads, causing multiple ElementRole objects sharing the same element role. This situation requires complicated logic in the Frank!Doc. Method registerChild is deprecated however. If we remove the registerChild methods, we may be able to remove much logic from the Frank!Doc. Doing so will make future development more easy.

Reporter
Martijn Dirkse

To Reproduce
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Input

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Environment

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• DBMS: [e.g. Oracle, MSSQL, MariaDB, MySql, PostgreSQL]
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Additional Context
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[jacodg]

We will do this later. Focus is now on releasing the xsd

[mhdirkse]

I checked whether we still have elements "Child" in the compatibility XSD. They are still there, so this issue cannot be picked up yet.