Debugger: Make QDateTime dumper work in release builds

Change-Id: I5f7b57385c77c4cd6bae9cf033bec91eeb984ac6
Reviewed-by: hjk <hjk121@nokiamail.com>
Debugger: Add createReferenceValue also to gbridge.py

Change-Id: I540616df3d4ca689495851783d1d111e14c28a3b
Reviewed-by: hjk <hjk121@nokiamail.com>