Update

Add the listring functionality https://github.com/minetest/minetest/commit/c977fbd9288d0e80019554411a2f1885f7760568

Remove line if set to the default of 'true'

Fix bookshelf's allow_metadata_inventory_move (check if item belongs to "book" group instead of checking if it is "default:book")

Used value: 2

Implemented nodes:
- Steel Door: Ignores explosion
- Locked Chest: Ignores explosion
- Fire: Ignores explosion
- TNT: Starts burning
- Burning TNT: Explodes immediately
- Gunpowder: Starts burning
- Burning Gunpowder: Ignores explosion

- Mese glows
- Glass + Mese = Meselamp
- New mese mineral texture

Pinetree (by sfan5, from mg mapgen) lua generation and sapling ABM. Add checks for ignore to other trees

use Zeg9`s texture

* Move furnace related code into furnace.lua
* Move duplicated code into functions
* Rewrite ABM:
	* Easier to follow strcuture (no returns in the middle)
	* No unnecessary calls to get_craft_result
	* Split logic and "visual feedback" (a bit)
	* Fewer calls to meta:set and meta:get
	* Better feedback on the current state of the furnace

Original author: @MT-Modder