The builtin QML plugins require to be imported with the full uri, i.e.
import Qt.labs.particles 1.0
so setting the import path to imports/Qt/labs and doing
import particles 1.0
is not supposed to work. (see QTBUG-11139)
This change adjusts qmldump to take an import path *and* the import uri,
so it will be able to dump the type information for these plugins.
Reviewed-by: Erik Verbruggen
Previously, the model manager always had exactly one import path - but
you can open more than one Qml project at once. Now, we store the union
of all import paths in the model manager.
Reviewed-by: Roberto Raggi
