Sync/link selection in database list and current MDI window

[pawelsalawa]

Whenever user focuses MdiChild that is "database aware", the DbTree should select corresponding database or table/view. If user selects anything else in the DbTree, does something - it's fine. Until the focus goes back to the MdiChild that is "database aware" - in which case again the syncing should take place.

It should be option, but it seems like a good idea to make it enabled by default.
It should be configurable in both configuration dialog, but also in header or database list, next to the filter input.