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/boats/init.lua

@@ -248,3 +248,9 @@ minetest.register_craft({
 		{"group:wood", "group:wood", "group:wood"},
 	},
 })
+
+minetest.register_craft({
+	type = "fuel",
+	recipe = "boats:boat",
+	burntime = 20,
+})