Fixes corrosive acid, makes most important things unacidable

Makes pretty much anything important to the crew unacidable, fixes how acid interacts with floors.

code/modules/reagents/machinery/chem_master.dm

@@ -3,6 +3,7 @@
 	desc = "Used to seperate and package chemicals in to patches, pills, or bottles. Warranty void if used to create Space Drugs."
 	density = TRUE
 	anchored = TRUE
+	unacidable = TRUE
 	icon = 'icons/obj/chemical.dmi'
 	icon_state = "mixer0"
 	circuit = /obj/item/weapon/circuitboard/chem_master

code/modules/reagents/machinery/dispenser/dispenser2.dm

@@ -18,6 +18,7 @@
 	use_power = USE_POWER_IDLE
 	idle_power_usage = 100
 	anchored = TRUE
+	unacidable = TRUE
 
 /obj/machinery/chemical_dispenser/Initialize()
 	. = ..()