Furnace assets (#1479)

Following suggestions in #1151, this adds the nonfunctional kiln,
furnace, bellows, and chimney blocks.


![image](https://github.com/user-attachments/assets/94e9de34-b1fc-4344-94e2-5cbfbbb7d394)

![image](https://github.com/user-attachments/assets/b9a071c6-5a09-4d09-b954-70a6e4af31a7)
And I even did lit textures.
![Recording 2025-05-18 at 19 10
56](https://github.com/user-attachments/assets/e96fd91b-3ed2-4045-a1c1-f6c9c056222e)

This is what I imagine for recipes:
```
Kiln
- 8 any stone

Furnace
- 8 terracotta

Bellows
- 2 planks
- 2 copper
- 4 leather

Chimney
- 4 terracotta
- 2 iron
```

There is a lot of changes because I had to do some consistency fixes
along the way:
- terracotta grout colour
- copper block palette changes
- change 1 colour of the torch flame

assets/cubyz/blocks/bellows.zig.zon

@@ -0,0 +1,18 @@
+.{
+	.tags = .{.wood},
+	.blockHealth = 5,
+	.drops = .{
+		.{.items = .{.auto}},
+	},
+	.rotation = .planar,
+	.model = "cubyz:bellows",
+	.texture = "cubyz:bellows/side",
+	.texture_front = "cubyz:bellows/nozzle",
+	.texture_left = "cubyz:bellows/nozzle",
+	.texture_right = "cubyz:bellows/side",
+	.texture_top = "cubyz:bellows/top",
+	.texture_bottom = "cubyz:bellows/bottom",
+	.item = .{
+		.texture = "bellows.png",
+	},
+}

assets/cubyz/blocks/chimney.zig.zon

@@ -0,0 +1,14 @@
+.{
+	.tags = .{.stone},
+	.blockHealth = 10,
+	.drops = .{
+		.{.items = .{.auto}},
+	},
+	.model = "cubyz:chimney",
+	.texture = "cubyz:chimney/side",
+	.texture_top = "cubyz:chimney/top",
+	.texture_bottom = "cubyz:chimney/bottom",
+	.item = .{
+		.texture = "chimney.png",
+	},
+}

assets/cubyz/blocks/furnace.zig.zon

@@ -0,0 +1,15 @@
+.{
+	.tags = .{.stone},
+	.blockHealth = 20,
+	.drops = .{
+		.{.items = .{.auto}},
+	},
+	.rotation = .planar,
+	.model = "cubyz:cube",
+	.texture = "cubyz:furnace/back",
+	.texture_front = "cubyz:furnace/front",
+	.texture_left = "cubyz:furnace/side",
+	.texture_right = "cubyz:furnace/side",
+	.texture_top = "cubyz:furnace/top",
+	.texture_bottom = "cubyz:furnace/bottom",
+}

assets/cubyz/blocks/kiln.zig.zon

@@ -0,0 +1,15 @@
+.{
+	.tags = .{.stone},
+	.blockHealth = 10,
+	.drops = .{
+		.{.items = .{.auto}},
+	},
+	.rotation = .planar,
+	.model = "cubyz:cube",
+	.texture = "cubyz:kiln/back",
+	.texture_front = "cubyz:kiln/front",
+	.texture_left = "cubyz:kiln/side",
+	.texture_right = "cubyz:kiln/side",
+	.texture_top = "cubyz:kiln/top",
+	.texture_bottom = "cubyz:kiln/bottom",
+}

assets/cubyz/blocks/textures/furnace/front_lit.zig.zon

@@ -0,0 +1,4 @@
+.{
+	.frames = 4,
+	.time = 150,
+}

assets/cubyz/blocks/textures/furnace/side_lit.zig.zon

@@ -0,0 +1,4 @@
+.{
+	.frames = 4,
+	.time = 150,
+}

assets/cubyz/blocks/textures/kiln/front_lit.zig.zon

@@ -0,0 +1,4 @@
+.{
+	.frames = 4,
+	.time = 150,
+}

assets/cubyz/blocks/textures/kiln/side_lit.zig.zon

@@ -0,0 +1,4 @@
+.{
+	.frames = 4,
+	.time = 150,
+}

assets/cubyz/models/bellows.obj

@@ -0,0 +1,162 @@
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assets/cubyz/models/chimney.obj

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