[feature] add proper array/plassein generation, textures, models and uses.

[meelock]

I need to create the textures for the varients, arrays use new tree gen code, plassein stems/blooms get chorus-like models.

I'm not certain about planks for the arrays/plassein, as they seem to mechanical/old to be made into planks, but maybe they could be sort of peeled, or something like that.