New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/routing/regions_decl.hpp

@@ -0,0 +1,17 @@
+#pragma once
+#include "geometry/point2d.hpp"
+#include "geometry/rect2d.hpp"
+
+#include <functional>
+#include <string>
+
+class DataSource;
+
+namespace routing
+{
+using CountryFileGetterFn = std::function<std::string(m2::PointD const &)>;
+using CountryRectFn = std::function<m2::RectD(std::string const & countryId)>;
+
+class Checkpoints;
+class NumMwmIds;
+} // namespace routing