Small stuff (#8)

* cave pearls and spindleshrooms (name subject to change) now are things. Not in mapgen yet.

* add the wandering "gas wisp" to light up some of the gas-filled caverns

* make wisps rarely spawned by gas explosions

* revamp spindlestems into a sort of mineral detector, add glowing extract bottles

* optimize pngs

* add gas wisps to mapgen

* add spindlestems to cavern level 1, most level 1 warrens are now lit up

* update internal names, adjust mineral detection range

* add cave pearls to some level 2 warrens and tunnels

* switch experimental simplecrafting_lib support to crafting mod

* Pearls don't grow on falling nodes

* put spindlestems with goblin caps, make them always grow red when near those

* bunch of documentation

* add castle coral to replace cave coral, which has been repurposed into column decoration

* documentation for cave coral, update some locale text

* add a recipe for cooking oil into paraffin

* add old bones to the underworld

* MIT license for bones_loot

* also cook black cap gills into paraffin, they're oily

* add salt crystals to the bloodthorn caverns, illuminating the floor

* documentation for salt crystals

* auto-generate minetestmapper colors.

need to update the spindlestem colours manually

* add spindlestem to fungiwood caverns too, and increase warren coverage

* in anticipation of eventually adding stuff below the Slade, making glowing pit erosion self-limiting.

* add a bit of displacement to the underside of the slade layer

* Unique images and names for cooking recipes.

* revamp bones loot

* add softer footsteps for some fungus types

* update mapgen_helper

* update cave coral screenshot

* mention glowing salts in bloodthorn caverns

oil/depends.txt

@@ -1,4 +1,5 @@
 default
 dynamic_liquid?
 bucket?
-doc?
+doc?
+basic_materials?

oil/init.lua

@@ -200,4 +200,14 @@ if minetest.get_modpath("bucket") then
 		burntime = 370, -- same as coalblock
 		replacements = {{"oil:oil_bucket", "bucket:bucket_empty"}},
 	})
+	
+	if minetest.get_modpath("basic_materials") then
+		minetest.register_craft({
+			type = "cooking",
+			output = "basic_materials:paraffin",
+			recipe = "oil:oil_bucket",
+			cooktime = 5,
+			replacements = {{"oil:oil_bucket", "bucket:bucket_empty"}},
+		})
+	end
 end

oil/mod.conf

@@ -1 +1,4 @@
-name = oil
+name = oil
+description = Oil liquid type
+depends = default
+optional_depends = dynamic_liquid, bucket, doc, basic_materials