Some fixes of status message view

* push_front as default (in most cases we have "latest first"
* as follow up of t270 use CListModelTimestampObjects

src/blackgui/models/statusmessagelistmodel.cpp

@@ -23,7 +23,7 @@ namespace BlackGui
     namespace Models
     {
         CStatusMessageListModel::CStatusMessageListModel(QObject *parent) :
-            CListModelBase<CStatusMessage, CStatusMessageList, true>("ViewStatusMessageList", parent)
+            CListModelTimestampObjects<CStatusMessage, CStatusMessageList, true>("ViewStatusMessageList", parent)
         {
             this->setMode(Detailed);