Add and edit fuel registrations

Edited fuels: fences, wooden ladder.
New fuels:
boat, paper, book, dry shrub, stick, vessels shelf, wooden tools,
wooden door, trapdoor, fence gates, farming crops, stairs, slabs, beds.

mods/vessels/init.lua

@@ -195,3 +195,9 @@ minetest.register_craft( {
 	output = "default:steel_ingot",
 	recipe = "vessels:steel_bottle",
 })
+
+minetest.register_craft({
+	type = "fuel",
+	recipe = "vessels:shelf",
+	burntime = 30,
+})