QmlJS: Separate metaObjectRevision from minor version number.

QmlJS: Separate metaObjectRevision from minor version number.

They need not to be identical. Additionally:
* Rename ImportInfo::name to path, because that's what it does.
* Add ImportInfo::name, for getting the uri with the names
  separated by dots.
* Allow for exportMetaObjectRevisions in qmltypes files.
* Allow for exports with an empty type name, as generated by
  qmlRegisterRevision. They are used for associating meta object
  revisions with non-exported types.
* Rewrite the Qt 4.7 import to QtQuick 1.0 at an early stage. In
  preparation for the Qt 5 type information update, where Qt 4.7
  is gone.

Change-Id: Ia287193623d9530a56b9eb8d2481d50aabd94c3e
Reviewed-on: http://codereview.qt-project.org/5309
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@nokia.com>