Be kind to the optimizer, pass coordinates by value (just two ints)

include/engine/plugins/hello_world.hpp

@@ -50,7 +50,7 @@ class HelloWorldPlugin final : public BasePlugin
 
         util::json::Array json_locations;
         unsigned counter = 0;
-        for (const util::FixedPointCoordinate &coordinate : routeParameters.coordinates)
+        for (const auto coordinate : routeParameters.coordinates)
         {
             util::json::Object json_location;
             util::json::Array json_coordinates;

include/engine/plugins/plugin_base.hpp

@@ -38,7 +38,7 @@ class BasePlugin
                                        const unsigned min = 2) const final
     {
         if (min > coordinates.size() || std::any_of(std::begin(coordinates), std::end(coordinates),
-                                                    [](const util::FixedPointCoordinate &coordinate)
+                                                    [](const util::FixedPointCoordinate coordinate)
                                                     {
                                                         return !coordinate.IsValid();
                                                     }))