Add layer wrapper and generic layer

scwx-qt/source/scwx/qt/map/generic_layer.cpp

@@ -0,0 +1,23 @@
+#include <scwx/qt/map/generic_layer.hpp>
+
+namespace scwx
+{
+namespace qt
+{
+namespace map
+{
+
+class GenericLayerImpl
+{
+public:
+   explicit GenericLayerImpl() {}
+
+   ~GenericLayerImpl() {}
+};
+
+GenericLayer::GenericLayer() : p(std::make_unique<GenericLayerImpl>()) {}
+GenericLayer::~GenericLayer() = default;
+
+} // namespace map
+} // namespace qt
+} // namespace scwx