[AppDB] Prepare for viewing versions using objectManager

[Alexander Nicolaysen Sørnes]

Add an optional objectGetCustomVars method to retrieve the custom variables a 
class uses for a specific function, such as viewing a table or displaying an 
entry. Checking whether the method is present and if it returns an array is 
done by an objectManager function. If any custom vars are required for an 
action, objectManager calls the object function like 'display($aVars)'; 
merely 'display()' otherwise.  Thus you can see at once if an object function 
requires special parameters.


Alexander N. Sørnes
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