* 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
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