fix et propagation de l'info Direction de scroll
Transition from one scene to another
Transition UP working
Multidirectional transitions!

TODO:
- sprite rotation and positions
- heavy refactor :)
- graze level glitch when transitioning to the right
- first bullets latency glitch
Minor bug fix: 2x scene loading
Support functions for multidirection coordinates
Functions plugged with the transition system :)
+polish
+ cosmetic
Correct enemy cluster position

TODO: rotation, fire direction, angles
offset [Directions] Rotation, vitesse and offsets
+ Bots offset and rotation
Small HUD adjustements and fixes
quick explosion optimization
[Simplification] transitions et spawn d'ennemis