Laser pointers, overchargeflashes, various fixes

Alcohol and thermite now flammable.  Laser pointers added!  Flash now
comes in delicious incendiary flavor.  Robot fire overlay bug fixed-ish.
Being lit on fire turns off a borg's lights but the fire still shows.
I'll take it.  Shield gens actually useable by the people they were
meant for.

code/modules/reagents/Chemistry-Reagents.dm

@@ -777,6 +777,13 @@ datum
 			reagent_state = SOLID
 			color = "#673910" // rgb: 103, 57, 16
 
+			reaction_mob(var/mob/living/M, var/method=TOUCH, var/volume)//Splashing people with welding fuel to make them easy to ignite!
+				if(!istype(M, /mob/living))
+					return
+				if(method == TOUCH)
+					M.adjust_fire_stacks(volume / 10)
+				return
+
 			reaction_turf(var/turf/T, var/volume)
 				src = null
 				if(volume >= 5)
@@ -3068,6 +3075,13 @@ datum
 			var/blur_start = 300	//amount absorbed after which mob starts getting blurred vision
 			var/pass_out = 400	//amount absorbed after which mob starts passing out
 
+			reaction_mob(var/mob/living/M, var/method=TOUCH, var/volume)//Splashing people with welding fuel to make them easy to ignite!
+				if(!istype(M, /mob/living))
+					return
+				if(method == TOUCH)
+					M.adjust_fire_stacks(volume / 10)
+				return
+
 			on_mob_life(var/mob/living/M as mob)
 				M:nutrition += nutriment_factor
 				holder.remove_reagent(src.id, FOOD_METABOLISM)