yet another api rework, removal of integer types in public api, optionals at the end, some cleaning

apps/demos/platformer/scenes/ingame.h

@@ -15,8 +15,6 @@ typedef struct SceneIngame {
     World *world;
     Player *player;
 
-    Camera cam;
-
     /* TODO: put this in a better place */
     float yaw;
     float pitch;