QmlJS: Rework exported C++ type registry.

The problem was that if you exported
A 1.0, A 1.1 and B 1.0 where A is the prototype of B
the code model had not enough information to know that, depending
on the import, B 1.0's prototype should be A 1.1 or A 1.0.

To solve this problem QmlObjectValues now store the import's version
as well as the local component version. In the example above B 1.0
would have import version 1.1 if the 1.1 module was imported and thus
be able to choose the right prototype.

Change-Id: I7ef33f12ca5a528c62b2a8240f4b5720b0ebd4c3
Reviewed-on: http://codereview.qt-project.org/5129
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@nokia.com>

src/plugins/qmljseditor/qmljssemantichighlighter.cpp

@@ -100,7 +100,7 @@ public:
     CollectStateNames(const ScopeChain &scopeChain)
         : m_scopeChain(scopeChain)
     {
-        m_statePrototype = scopeChain.context()->valueOwner()->cppQmlTypes().typeByCppName(QLatin1String("QDeclarativeState"));
+        m_statePrototype = scopeChain.context()->valueOwner()->cppQmlTypes().objectByCppName(QLatin1String("QDeclarativeState"));
     }
 
     QStringList operator()(Node *ast)