refactor: change pointer parameters to references for Level and Content in various classes

src/physics/PhysicsSolver.hpp

@@ -19,14 +19,14 @@ public:
     PhysicsSolver(glm::vec3 gravity);
     void step(
         const GlobalChunks& chunks,
-        Hitbox* hitbox,
+        Hitbox& hitbox,
         float delta,
         uint substeps,
         entityid_t entity
     );
     void colisionCalc(
         const GlobalChunks& chunks,
-        Hitbox* hitbox,
+        Hitbox& hitbox,
         glm::vec3& vel,
         glm::vec3& pos,
         const glm::vec3 half,