Ports table item autoalign from Bay (#6946)

Made it so items get their pixel x/y reset on pickup.
    Thrown items now also get their pixel placement slightly randomized.
    Tweaked the center of mass on a boatload of items to be more accurate to their sprite art.
    Replaced a bunch of randomized pixel placement code into a unifying proc; randpixel_xy() that uses an item's randpixel var.

code/modules/reagents/reagent_containers/inhaler.dm

@@ -6,6 +6,7 @@
 	icon = 'icons/obj/syringe.dmi'
 	item_state = "autoinjector"
 	icon_state = "inhaler1"
+	center_of_mass = list("x" = 16,"y" = 11)
 	var/empty_state = "inhaler0"
 	unacidable = 1
 	amount_per_transfer_from_this = 5