Add final progression to tiny sword, fixes and tweeks required

docs/gyms/tiny_sword/buildings/barracks/barracks.gd

@@ -0,0 +1,25 @@
+extends Node2D
+
+const UNLOCK_GOAL_ID: StringName = &"gold_50M_food_5M_wood_5M"
+
+@onready var _sprite: Sprite2D = $Sprite2D
+@onready var _area: Area2D = $Area2D
+@onready var _game_state: LevelGameState = find_parent("LevelGameState")
+
+
+func _ready() -> void:
+	_sprite.visible = false
+	_area.monitoring = false
+	_game_state.goal_completed.connect(_on_goal_completed)
+	if _game_state.is_goal_completed(UNLOCK_GOAL_ID):
+		_unlock()
+
+
+func _on_goal_completed(goal_id: StringName) -> void:
+	if goal_id == UNLOCK_GOAL_ID:
+		_unlock()
+
+
+func _unlock() -> void:
+	_sprite.visible = true
+	_area.monitoring = true