Dashboard Master Template

This is a specific case of the more general needed feature of linked (inherited) clones -- this applies to anything that can be cloned so that inheritance and overrides can be leveraged. My original request on this many years back applied to LogicModules (datasources primarily), but the same applies here and to virtually any primary object type that can be cloned. I have been pushing for this repeatedly across the years. Instead of linked clones for modules we now have SMR via Exchange -- much better than blind replacement, but linked clones would be far superior (including this dashboard inheritance use case).