Merge pull request #9418 from Ghommie/Ghommie-cit216

Porting a load of viro, (sentient) disease, symptoms code updates from tg.

code/modules/mob/mob.dm

@@ -830,6 +830,9 @@
 /mob/proc/canUseTopic(atom/movable/M, be_close=FALSE, no_dextery=FALSE, no_tk=FALSE)
 	return
 
+/mob/proc/canUseStorage()
+	return FALSE
+
 /mob/proc/faction_check_mob(mob/target, exact_match)
 	if(exact_match) //if we need an exact match, we need to do some bullfuckery.
 		var/list/faction_src = faction.Copy()