Add "Drownable Air" node (`maptools:drowning`) (#18)

Co-authored-by: Hugo Locurcio <hugo.locurcio@hugo.pro>
Co-authored-by: BuckarooBanzay <BuckarooBanzay@users.noreply.github.com>

NODES_ITEMS.md

@@ -23,6 +23,7 @@ as they cannot be removed by hand (they can only be removed with
 | `maptools:no_interact`  | Prevents interacting through the block (opening chests, furnaces, attacking entities, …), but can still be walked through.                                             |
 | `maptools:damage_{1…5}` | :warning: Damaging blocks which damage players by 1 to 5 HP per second.                                                                                                |
 | `maptools:kill`         | :warning: Instant kill blocks (damages players by 20 HP per second).                                                                                                   |
+| `maptools:drowning`     | :warning: Simulates drowning in water.                                         |
 | `maptools:light_block`  | :warning: Invisible non-solid block, prevents light from passing through.                                                                                              |
 | `maptools:light_bulb`   | :warning: Invisible non-solid block, emitting the maximum amount of light.                                                                                             |
 

nodes.lua

@@ -467,3 +467,18 @@ minetest.register_node("maptools:superapple", {
 	sounds = default.node_sound_defaults(),
 	on_drop = maptools.drop_msg
 })
+
+minetest.register_node("maptools:drowning", {
+	description = S("Drownable Air"),
+	range = 12,
+	stack_max = 10000,
+	inventory_image = "default_steel_block.png^dye_black.png",
+	drawtype = "airlike",
+	paramtype = "light",
+	pointable = false,
+	drowning = true,
+	sunlight_propagates = true,
+	drop = "",
+	groups = {unbreakable = 1, not_in_creative_inventory = maptools.creative},
+	on_drop = maptools.drop_msg
+})