[LIB] Allow buildings to require multiple fuels

[LWM]

I put together a little utility mod that allows buildings to require multiple fuels.  So you could create, for example, a steam-powered felting biolathe that burns both wood and muffalo wool and creates new fedoras every few hours.  Or whatever.

So if anyone wants to use it, go ahead and go wild!

(This mod does not, in and of itself, add any buildings to the game)

https://github.com/lilwhitemouse/RimWorld-LWM-Multi-Fuel-Requirement

--LWM