Alcohol additions and fixes (#2052)

Project partially commissioned by Senpai Jackboot.

This PR adds a new reagent, butanol. It is an alcohol intended for unathi consumption, intoxicating and safe for them. On other species it is also safe, but has a fairly minimal effect, and humans drinking it is generally a waste.
Butanol moonshine can be made in the kitchen by delinquent lizards.

Adds two butanol based drinks, imported from moghes.

Also adds a new Tajaran Gin, slightly weaker than a normal spirit. This is an ordinary ethanol drink with some kitty flavour text.

Kegs of beer and xuizi juice can now be ordered in cargo. Prices may seem low but they come in a non-returnable large wooden crate

Fixes several bugs with alcohol effects not wearing off.
While fixing this I ran into another issue, and the easiest fix was something i've been meaning to do for a while:
Added a verb for bluespace techs to toggle their god mode on and off.
Intoxication with god mode on is now essentially disabled. It was causing too many buggy effects. If bluespace techs want to get drunk for adminbus RP, they can disable godmode first.

Fixes #1748

code/modules/admin/verbs/bluespacetech.dm

@@ -329,6 +329,14 @@
 		C.holder.original_mob = null
 	suicide()
 
+/mob/living/carbon/human/bst/verb/tgm()
+	set name = "Toggle Godmode"
+	set desc = "Enable or disable god mode. For testing things that require you to be vulnerable."
+	set category = "BST"
+
+	status_flags ^= GODMODE
+	src << span("notice", "God mode is now [status_flags & GODMODE ? "enabled" : "disabled"]")
+
 //Equipment. All should have canremove set to 0
 //All items with a /bst need the attack_hand() proc overrided to stop people getting overpowered items.