DeviceAppliactionRunner: Remove unused connection

The whole class can be removed easily now. But I was promised further
refactorings in that area anyway.

Change-Id: I20d200c6acc52604cd2c273f336374ef22626323
Reviewed-by: hjk <hjk121@nokiamail.com>
QmlProjectRunConfiguration: Derive from LocalApplicationRunConfiguration

Change-Id: I4a7c29f2f679e62bae6fa3d01983851207e532c8
Reviewed-by: hjk <hjk121@nokiamail.com>