[AppDB] Allow appData constructor to import appData-derived objects

[Alexander Nicolaysen Sørnes]

Classes which store their information in the appData table usually call 
appData functions for displaying a table row etc., in which case they need to 
initialize an appData object.  Since the relevant information is already 
present in the current one, it makes sense to allow the appData constructor 
to import this.
The previous approach was to return an appData object in 
objectGetInstanceFromRow().


Regards,

Alexander N. Sørnes
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