Glass Sleek Doors

<p>Adds visible glass panes to the windows of sleek doors and makes sleek doors airtight for cellars.</p> <p>Doesn't effect availability of sleek doors, which can only be aquired from furniture traders unless another mod adds a crafting recipe.</p> <p>Version that makes sleek doors airtight without changing their appearance: <a href="https://mods.vintagestory.at/airtightsleekdoors">Airtight Sleek Doors</a></p>