Cleanup goal unlocks behaviour

core/goals/goal_data.gd

@@ -1,8 +1,14 @@
 class_name GoalData
 extends Resource
 
+enum UnlockBehavior {
+	AUTOMATIC,
+	MANUAL,
+}
+
 @export var id: StringName = &""
 @export var requirements: Array[GoalRequirementData] = []
+@export var unlock_behavior: UnlockBehavior = UnlockBehavior.MANUAL
 
 func has_id() -> bool:
 	return not String(id).strip_edges().is_empty()