Ajout des mutations Sauveteuse, Adaptative et résistante, ajout des crédits du jeu et d'un splash screen (+ un peu de debug)

entities/plants/scripts/plant_data.gd

@@ -17,6 +17,7 @@ enum State {PLANTED, GROWING, MATURE, DEAD}
 
 var decontamination_area_factor = 0.
 var nearby_plants : Array[PlantData]
+var region_data : RegionData
 
 func _init(
     _position: Vector2 = Vector2.ZERO,
@@ -149,7 +150,14 @@ func get_score_buff() -> int:
         buff = m.mutate_score_buff(self, buff)
     
     return buff
+
+func get_mutation_probability_boost() -> float:
+    var boost = 0
+
+    for m in mutations:
+        boost = m.mutate_mutation_probability_boost(self, boost)
     
+    return boost
 
 func disappear():
     disappeared.emit(self )