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ROADMAP (SHORT-TERM)
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- Update README.
	- Add "gameplay basics"
		- Crafting in-world
		- Pummeling
		- Sensitivity to which node face
		- Check inventory screen for hints
	- Installation guide?
- Containers.
	- A bag that expands when placed, if room.
		- Inventory slots around central node each holds 1 stack.
		- Dig central node to bundle up, store content in metadata.
	- For now, nesting is not allowed.
- Fire tech.
	- Fire rework.
		- Migrate to first-class API.
			- Proper API for burning up items
				- on_burn?  burns_to?
			- Move heat and quench calcs all into API.
			- Cumulative heat helpers?
				- Maybe generalized time-cumulative helpers that
				  could be used with plant growth too?
			- Unify heat transformations into recipe system with
			  cooking recipes?
		- Make fuel consumed slower by reducing flame exposure.
			- Encourages designing a better furnace.
		- Smothering produces charcoal instead of ash.
			- Can be reburned.  Maybe easier to ignite?
			  Maybe rejuvenate fuel in exchange for effort?
		- Make ash whiter, charcoal black.
- Plant life stuff
	- Tree growth catchup.
		- Set last time calc at place-time and in ABM
		- Define growth rate as gaussian, compute cumulative
		  growth as a single box-mueller transform upon ABM
		- Visually show progress, e.g. display a sprout or
		  something above, to give feedback.
		- Require light.  
	- Leaves settle into grass as podzol?  Composting/decay?
	- Dirt/sand/etc should self-compact if buried or over time.
	  OR loose dirt should grow grass.

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