Animation blending

- transition smoothly between idle and run animations
- use quaternions (versors) instead of yaw/pitch/roll
- hide mouse and enable free-look mode by default on startup
- rotate model 180 degrees in Blender so it faces away from the camera by default
- add some makefile commands

src/game.h

@@ -22,6 +22,8 @@ typedef struct
 typedef struct
 {
 	bool running;
+	bool charIsMoving;
+	float animBlend;
 	uint64_t previousTicks;
 	InputState input;
 	SDL_Window *window;