Add text event pruning

- Still need to prune AlertLayer
- Still need to test alerts reload after being pruned

scwx-qt/source/scwx/qt/ui/alert_dock_widget.cpp

@@ -131,6 +131,11 @@ void AlertDockWidgetImpl::ConnectSignals()
            &QAction::toggled,
            proxyModel_.get(),
            &model::AlertProxyModel::SetAlertActiveFilter);
+   connect(textEventManager_.get(),
+           &manager::TextEventManager::AlertsRemoved,
+           alertModel_.get(),
+           &model::AlertModel::HandleAlertsRemoved,
+           Qt::QueuedConnection);
    connect(textEventManager_.get(),
            &manager::TextEventManager::AlertUpdated,
            alertModel_.get(),