Rename existing AlertLayer to AlertLayerOld, prepare AlertLayer skeleton

scwx-qt/source/scwx/qt/map/alert_layer_old.hpp

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <scwx/awips/phenomenon.hpp>
+#include <scwx/qt/map/map_context.hpp>
+
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace scwx
+{
+namespace qt
+{
+namespace map
+{
+
+class AlertLayerOldImpl;
+
+class AlertLayerOld
+{
+public:
+   explicit AlertLayerOld(std::shared_ptr<MapContext> context);
+   ~AlertLayerOld();
+
+   std::vector<std::string> AddLayers(awips::Phenomenon  phenomenon,
+                                      const std::string& before = {});
+
+private:
+   std::unique_ptr<AlertLayerOldImpl> p;
+};
+
+} // namespace map
+} // namespace qt
+} // namespace scwx