Issue #4 - Porting resize (micro/macro) systems.

* Instead of "playerscale" we are using pre-existing variable
 "size_multiplier" but we move it to /mob/living
* Added basic mechanics of size changing.
* Mousetraps snap small people even if they have shoes.
* Big people can walk over small people, or stomp them, or capture them
 in foot slot.
* Ported holder for micros, making small people scoopable.
* Tied held micros in with the vore code so they are edible.
* Ported size-altering reagents and recipies.
* Ported size gun along with associated sprites and sounds.

code/modules/hydroponics/seed_datums_vr.dm

@@ -0,0 +1,34 @@
+
+//Vore Originals
+
+/datum/seed/size
+	name = "microm"
+	seed_name = "Shrinking Mushroom"
+	display_name = "Shrinking mushroom trees"
+	mutants = list("megam")
+	kitchen_tag = "microm"
+	chems = list("microcillin" = list(1,20))
+
+/datum/seed/size/New()
+	..()
+	set_trait(TRAIT_HARVEST_REPEAT,1)
+	set_trait(TRAIT_MATURATION,6)
+	set_trait(TRAIT_PRODUCTION,6)
+	set_trait(TRAIT_YIELD,3)
+	set_trait(TRAIT_POTENCY,15)
+	set_trait(TRAIT_PRODUCT_ICON,"sizeshroom")
+	set_trait(TRAIT_PRODUCT_COLOUR,"#DA00DA")
+	set_trait(TRAIT_PLANT_ICON,"tree")
+
+
+/datum/seed/size/megam
+	name = "megam"
+	seed_name = "Mega Mushroom"
+	display_name = "Mega mushroom trees"
+	mutants = list("microm")
+	kitchen_tag = "megam"
+	chems = list("macrocillin" = list(1,20))
+
+/datum/seed/size/megam/New()
+	..()
+	set_trait(TRAIT_PRODUCT_COLOUR,"#DADA00")