Introduce errorString() to be able to obtain load errors
in Qt Designer. Remove automatic Qt 3 form conversion
from Qt Designer (since uic3 no longer exists) and move
all form load error checking logic including language
check into QAbstractFormBuilder.
Make language accessible in FormBuilderExtra in case
Jambi is revived.
Reviewed-by: hjk
Remove virtual functions obsoleted by new resource handling
in Qt Designer 4.4. Remove static hash of private objects
for formbuilder.
Requires fd61c9b24d27452df3eb478a81d7e7725fe6f5b4 in qttools.
Rubber-stamped-by: axis
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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12
