Merge: Intro Action Nitro!

This PR intro our submission for the clibre gamejam. An action platformer where the goal is to jump from plane to plane and reach the ISS to kill the bad guys. It features explosion physics, randomly generated platforms, many weapons, a powerup system, blood, standing on helicopter rotors, an evil 3D ISS, and more!

This game uses both the sprites of gamnit flat and 3D models with gamnit depth. It has many particle effects and manipulates the camera to create custom animations.

Ping the cocreators @R4PaSs, @BlackMinou, @MehdiAit.

Pull-Request: #1938
Reviewed-by: Jean Privat <jean@pryen.org>