ajout des mutation et refonte de l'inspecteur

* ajout des mutations #86
* changement de l'objectif #85
* refonte de l'inspecteur #71
* changement léger de la plantation
* les plantes ne donnent que des graines de leurs espèces
* refonte partielle du code, refacto

entities/plants/scripts/plant_mutation/sociable_mutation.gd

@@ -0,0 +1,28 @@
+extends PlantMutation
+class_name SociableMutation
+
+const NEAR_PLANT_NEEDED = 2
+
+func get_icon() -> Texture:
+    return preload("res://common/icons/seedling.svg")
+
+func get_base_rarity() -> int:
+    return 0
+
+func get_mutation_name() -> String:
+    return "Sociable"
+
+func get_mutation_description() -> String:
+    return "Add [b]%d[/b] to the score if near %d other plants" % [get_score_bonus(), NEAR_PLANT_NEEDED]
+
+func get_score_bonus():
+    return (level + 2)
+
+func mutate_score(plant : Plant, score) -> int:
+    var plant_count = 0
+
+    for area in plant.influence_zone.get_overlapping_areas():
+        if area is Plant:
+            plant_count += 1
+
+    return score + (get_score_bonus() if plant_count >= NEAR_PLANT_NEEDED else 0)