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/research/message_server.dm

@@ -54,6 +54,7 @@ var/global/list/obj/machinery/message_server/message_servers = list()
 	desc = "Facilitates both PDA messages and request console functions."
 	density = TRUE
 	anchored = TRUE
+	unacidable = TRUE
 	use_power = USE_POWER_IDLE
 	idle_power_usage = 10
 	active_power_usage = 100
@@ -239,6 +240,7 @@ var/obj/machinery/blackbox_recorder/blackbox
 	desc = "Records all radio communications, as well as various other information in case of the worst."
 	density = TRUE
 	anchored = TRUE
+	unacidable = TRUE
 	use_power = USE_POWER_IDLE
 	idle_power_usage = 10
 	active_power_usage = 100