[AppDB] Add multi-page support to objectManager, use it for vendor class

[Alexander Nicolaysen Sørnes]

This allows the objectManager to display selectors for the number of items per 
page and which page is currently displayed.  This should dramatically 
decrease the load time of large tables such as the one for vendors, which is 
the only class for which this patch enables the controls.



Regards,

Alexander N. Sørnes
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