Add MaterialData for Flower

[jimmikaelkael]

This allow to identify the ten types of flowers: dandelion, poppy, blue orchid, allium, houstonia, red tulip, orange tulip, white tulip, pink tulip and oxeye daisy.

For tulips, I'm not quite sure if it should be named TULIP_RED or RED_TULIP for example.

[turt2live]

(I haven't looked at the code yet, just responding to a concern in the description)

TULIP_RED is ideal

[jimmikaelkael]

Thank you. I'm lucky that's the pattern I've choosen.