Currently 'jungle wood' is a material type of WOOD, but using the Tree class and the TreeSpecies in the data. Need to work out a way to handle that within the recipe item specification.
The impact at the moment is in the recipe management, specifying :wood as a material type doesn't work unless it's the generic wood. The recipe system should, in wood's case, automatically handle all wood types if only :wood is selected and provide a simple way to specify the kind of wood required.
This goes for other similar Material's like step, double step and possibly others.
Loads of changes, mostly materials & items.
Resolves #30, #29, #26