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

df_farming/textures/license.txt

@@ -10,3 +10,38 @@ dfcaverns_bread - derived from farming
 dfcaverns_pig_tail_thread - copied from farming
 dfcaverns_sugar - derived from farming
 dfcaverns_cave_wheat_seed, dfcaverns_pig_tail_seed - all derived from farming wheat seed
+
+
+
+dfcaverns_prepared_food01 - https://commons.wikimedia.org/wiki/File:Croissants-2.jpg public domain 2005 by Christophe Marcheux
+dfcaverns_prepared_food02 - https://commons.wikimedia.org/wiki/File:Boule_de_campagne_01.jpg CC-BY-3.0 2007 by Zantastik
+dfcaverns_prepared_food03 - https://commons.wikimedia.org/wiki/File:Essene_Bread_70pct_Rye_Sproud_30pct_Spelt_cut.JPG CC-BY-SA 3.0 2010 by Fritzs
+dfcaverns_prepared_food04 - https://commons.wikimedia.org/wiki/File:Essene_Bread_Spelt_Sproud_cut.JPG CC-BY-SA 3.0 2010 by Fritzs
+dfcaverns_prepared_food05 - https://commons.wikimedia.org/wiki/File:Tarte_%C3%A0_la_mirabelle_-_20050831.jpeg CC-BY-SA 3.0 and GFDL 1.2 2005 by Sam Hocevar
+dfcaverns_prepared_food06 - https://commons.wikimedia.org/wiki/File:Dry_fruit.jpg CC-BY-SA 2.5 2005 by André Karwath
+dfcaverns_prepared_food07 - https://commons.wikimedia.org/wiki/File:Steinpilzrisotto.jpg CC-BY-SA 3.0 2006 by Rainer Zenz
+dfcaverns_prepared_food08 - https://commons.wikimedia.org/wiki/File:Koernerbroetchen.jpg CC-BY-SA 3.0 2007 by Körnerbrötchen
+dfcaverns_prepared_food09 - https://commons.wikimedia.org/wiki/File:Semmelkn%C3%B6del.jpg CC-BY-SA 2.5 2005 by Kobako
+dfcaverns_prepared_food10 - https://commons.wikimedia.org/wiki/File:Gulasch.jpg CC-BY-SA 2.5 2006 by Kobako
+dfcaverns_prepared_food11 - https://commons.wikimedia.org/wiki/File:Chleb_-_polish_bread.jpg Public Domain 2006 by R a f
+dfcaverns_prepared_food12 - https://commons.wikimedia.org/wiki/File:CocinaPalentina-Pan_002.jpg CC-BY-SA 3.0 2011 by Valdavia
+dfcaverns_prepared_food13 - https://commons.wikimedia.org/wiki/File:Pompei_pane.jpg CC-BY-SA 2.0 Italy 2006 by Beatrice
+dfcaverns_prepared_food14 - https://commons.wikimedia.org/wiki/File:Apple_pie.png CC-BY-SA 3.0 2018 by Tiia Monto
+dfcaverns_prepared_food15 - https://commons.wikimedia.org/wiki/File:Assam-Tee_SFTGFOP1.jpg CC-BY-SA 3.0 2010 by André Helbig
+dfcaverns_prepared_food16 and food17 - https://commons.wikimedia.org/wiki/File:Basler_Brot_white_background.jpg CC-BY-SA 3.0 2008 by Sandstein
+dfcaverns_prepared_food18 - https://commons.wikimedia.org/wiki/File:Beetroot2.jpg CC-BY-SA 4.0 International 2016 by Tiia Monto
+dfcaverns_prepared_food19 - https://commons.wikimedia.org/wiki/File:Bugnes_white_background.jpg CC-BY-SA 2.5 Generic 2013 by Marie-Lan Nguyen
+dfcaverns_prepared_food20 - https://commons.wikimedia.org/wiki/File:Cheeseburger_au_restaurant_Quick_%C3%A0_Coigni%C3%A8res_le_12_avril_2017_-_2.jpg CC-BY-SA 3.0 2017 by Lionel Allorge
+dfcaverns_prepared_food21 - https://commons.wikimedia.org/wiki/File:Choc-Chip-Cookie.jpg Public Domain 2011 by Evan-Amos
+dfcaverns_prepared_food22 - https://commons.wikimedia.org/wiki/File:Chocolate_walnut_cookie.jpg CC-BY-SA 4.0 International 2015 by Tiia Monto
+dfcaverns_prepared_food23 - https://commons.wikimedia.org/wiki/File:Fogaca_Sweet_Bread.jpg Public Domain 2005 by Paula Santos
+dfcaverns_prepared_food24 - https://commons.wikimedia.org/wiki/File:Bonbons_Ricola_Citron_M%C3%A9lisse_-_1.jpg CC-BY-SA 3.0 2015 by Lionel Allorge
+dfcaverns_prepared_food25 and food26 - https://commons.wikimedia.org/wiki/File:Betel_nuts3.jpg CC-BY-SA 3.0 2008 by Henryk Kotowski
+dfcaverns_prepared_food27 - https://commons.wikimedia.org/wiki/File:Criollo.jpg CC-BY-SA 3.0 2004 by Fyyfabian
+dfcaverns_prepared_food28 - https://commons.wikimedia.org/wiki/File:Croissant-Petr_Kratochvil.jpg Public Domain 2011 by Petr Kratochvil
+dfcaverns_prepared_food29 - https://commons.wikimedia.org/wiki/File:Rogalik.jpg Public Domain 2005 by Julo
+dfcaverns_prepared_food30 - https://commons.wikimedia.org/wiki/File:Cod_fillet.jpg CC-BY-40 International 2018 by Tiia Monto
+dfcaverns_prepared_food31 - https://commons.wikimedia.org/wiki/File:California_roll.jpg CC-BY-SA 3.0 2018 by Tiia Monto
+dfcaverns_prepared_food32 - https://commons.wikimedia.org/wiki/File:Kajzerka.jpg Public Domain 2005 by Julo
+dfcaverns_prepared_food33 - https://commons.wikimedia.org/wiki/File:Celery_root.jpg CC-BY-SA 3.0 2019 by Tiia Monto
+dfcaverns_prepared_food34 - https://commons.wikimedia.org/wiki/File:Cherry-Pie-Whole.jpg Public Domain 2011 by Evan-Amos