Cleanup QTableView autotest:
- use range-based for loops where possible
- use nullptr
- use member initialization
- use new signal/slot syntax
- remove a lot of c-style casts
- use static invocations
- use override
- instantiate objects on stack instead heap to avoid memleaks
Change-Id: I52fee26697b1732afa9f965e600d4c59551370ce
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
6f8fc4217a