QmlJS: Move the exported-C++-type detection out of C++ code.

It now lives in qmljstools/qmljsfindexportedcpptypes, all in one place.

Also ensures that the source code is available when a file is being
scanned for QML exports. This will enable checking comments for
annotations about the URI a plugin is usually imported as.

Change-Id: I1da36d0678e0a8d34b171dbe0f6b5690d89eb18b
Reviewed-on: http://codereview.qt.nokia.com/3392
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@nokia.com>

src/libs/qmljs/qmljslink.cpp

@@ -502,7 +502,9 @@ void Link::loadImplicitDefaultImports(Imports *imports)
             import.info = info;
             import.object = new ObjectValue(d->valueOwner);
             foreach (QmlObjectValue *object,
-                     d->valueOwner->cppQmlTypes().typesForImport(defaultPackage, ComponentVersion())) {
+                     d->valueOwner->cppQmlTypes().typesForImport(
+                         defaultPackage,
+                         ComponentVersion(ComponentVersion::MaxVersion, ComponentVersion::MaxVersion))) {
                 import.object->setMember(object->className(), object);
             }
             d->importCache.insert(ImportCacheKey(info), import);