Use qAsConst with non-const Qt containers in range-loops

... in various places

Change-Id: Ic6c0c1b9437a1ed402105c7a14a1f5f9454a68d4
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>

src/plugins/cmakeprojectmanager/configmodel.cpp

@@ -303,7 +303,7 @@ void ConfigModel::generateTree()
 
     // Generate nodes for *all* prefixes
     QHash<QString, QList<Utils::TreeItem *>> prefixes;
-    for (const InternalDataItem &di : m_configuration) {
+    for (const InternalDataItem &di : qAsConst(m_configuration)) {
         const QString p = prefix(di.key);
         if (!prefixes.contains(p)) {
             prefixes.insert(p, {});