Using alias-declaration instead of typedef-name

Author: sdavydouski

src/input/EventHandlers.h

@@ -2,4 +2,4 @@
 
 #include <functional>
 
-typedef std::function <void (float delta)> KeyHandler;
+using KeyHandler = std::function <void (float delta)>;

src/physics/Collision.h

@@ -4,4 +4,4 @@
 #include <glm/vec2.hpp>
 #include <tuple>
 
-typedef std::tuple<bool, Direction, glm::vec2> Collision;
+using Collision = std::tuple<bool, Direction, glm::vec2>;