qmljs: improve qmltype parsing error messages

add filename to each error message.

Change-Id: I2b9f550147acfe6993f1e7d878fdda863182a2a0
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>
qmljs: qmltypes, added isCreatable, isSingleton, isComposite

Change-Id: I62cd3736de46b25107e5ea5f6d8e8dcafaa5e11a
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@digia.com>