QmlJSEditor: Build Snapshot by looking at imports of parsed files.

Previously we just scanned every directory containing a qml file for
other qml files.

This makes import ".." work.

Reviewed-by: Erik Verbruggen

src/plugins/qmlprojectmanager/qmlproject.cpp

@@ -106,7 +106,7 @@ void QmlProject::parseProject(RefreshOptions options)
         }
         if (m_projectItem) {
             m_projectItem.data()->setSourceDirectory(projectDir().path());
-            m_modelManager->updateSourceDirectories(m_projectItem.data()->files());
+            m_modelManager->updateSourceFiles(m_projectItem.data()->files());
         }
         m_rootNode->refresh();
     }