tst_qdeclarativeimage: it's OK to receive a network image in chunks

and if so, there can be more than 2 signals to update progress.

Task-number: QTBUG-31065
Change-Id: I36294eb8a40c0e8d4beac29a8484260d5cfe6e73
Reviewed-by: Simo Fält <simo.falt@digia.com>
Reviewed-by: Liang Qi <liang.qi@digia.com>
Move exports conflicting with QtQml into namespace

Move exported qml* symbols that conflict with QtQml into an - automatically
imported - namespace. This ensures apps can link against both
QtDeclarative and QtQml.

To keep the BC promise the old symbols are still exported.

Task-number: QTBUG-29584
Change-Id: Icf4e586fee51d2bd82125398e2bb96d6dd355cc5
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Alan Alpert <aalpert@blackberry.com>