added player Finite State Machine

PCs/FSM/building_state.gd

@@ -0,0 +1,30 @@
+class_name BuildingState
+extends HeroState
+
+@export var swap_state: HeroState
+
+
+func enter_state() -> void:
+	hero.edit_tool.enabled = true
+	hero.game_manager.level.enable_non_path_tower_frames()
+
+
+func exit_state() -> void:
+	hero.edit_tool.interact_key_held = false
+	hero.edit_tool.enabled = false
+	hero.game_manager.level.disable_all_tower_frames()
+
+
+func process_state(_delta: float) -> void:
+	hero.check_world_button()
+	if Input.is_action_just_pressed("Primary Fire"):
+		hero.edit_tool.interact_key_held = true
+	if Input.is_action_just_released("Primary Fire"):
+		hero.edit_tool.interact_key_held = false
+	if Input.is_action_just_pressed("Swap Weapons"):
+		state_changed.emit(swap_state)
+	if Input.is_action_pressed("Ready"):
+		if hero.ready_state:
+			hero.unready_self()
+		else:
+			hero.ready_self()