Unused structures in ancient cities

The ancient_city/entrance folder contains the following structures that are not added to any template pool and can thus never generate:

• bottom_piece
• bottom_piece_1
• bottom_piece_2
• bottom_piece_3
• top_piece

The ancient_city/walls folder contains the following structure that is not added to any template pool:

• intact_horizontal_wall_stairs_upward

The ancient_city/structures folder contains the following structure that is not added to any template pool:

• small_portal_statue