After qmljsdebugger was moved to share/, the build order of
qmlobserver and qmljsdebugger had to be re-adjusted.

Reviewed-By: Lasse Holmstedt

This qmlviewer will be also the default one when opening qmlproject files
as the runconfiguration was changed too.

Reviewed-by: Oswald Buddenhagen

Task-number: QTCREATORBUG-1021
Reviewed-by: Roberto Raggi