Add date palm

Spawns in hot and dry desert, but requires water. This makes it a bit harder to
find, but where found, it can be more abundant.
If found in the middle of a desert, its presence indicates a water source below
the surface.

As an additional optional feature, dates (slowly) grow back after harvesting.

crafts.lua

@@ -63,6 +63,12 @@ minetest.register_craftitem("moretrees:raw_coconut", {
 	on_use = minetest.item_eat(4),
 })
 
+minetest.register_craftitem("moretrees:date", {
+	description = S("Date"),
+	inventory_image = "moretrees_date.png",
+	on_use = minetest.item_eat(1),
+})
+
 minetest.register_craftitem("moretrees:acorn_muffin_batter", {
 	description = S("Acorn Muffin batter"),
 	inventory_image = "moretrees_acorn_muffin_batter.png",