Revise the Table View example

A simple sortable and searchable table view example that
also fits a mobile screen. The old "example" is demoted
as a manual test app.

Task-number: QTBUG-41253
Change-Id: I746c8e5871c35a184748abbb4427ca3d160ffc8e
Reviewed-by: Venugopal Shivashankar <venugopal.shivashankar@digia.com>
Reviewed-by: Caroline Chao <caroline.chao@theqtcompany.com>