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/power/apc.dm

@@ -92,6 +92,7 @@ GLOBAL_LIST_EMPTY(apcs)
 	icon_state = "apc0"
 	layer = ABOVE_WINDOW_LAYER
 	anchored = TRUE
+	unacidable = TRUE
 	use_power = USE_POWER_OFF
 	clicksound = "switch"
 	req_access = list(access_engine_equip)

code/modules/power/breaker_box.dm

@@ -14,6 +14,7 @@
 	var/icon_state_off = "bbox_off"
 	density = TRUE
 	anchored = TRUE
+	unacidable = TRUE
 	circuit = /obj/item/weapon/circuitboard/breakerbox
 	var/on = 0
 	var/busy = 0

code/modules/power/cable.dm

@@ -46,6 +46,7 @@ var/list/possible_cable_coil_colours = list(
 /obj/structure/cable
 	level = 1
 	anchored =TRUE
+	unacidable = TRUE
 	var/datum/powernet/powernet
 	name = "power cable"
 	desc = "A flexible superconducting cable for heavy-duty power transfer."

code/modules/power/generator.dm

@@ -6,6 +6,7 @@ GLOBAL_LIST_EMPTY(all_turbines)
 	icon_state = "teg-unassembled"
 	density = TRUE
 	anchored = FALSE
+	unacidable = TRUE
 
 	use_power = USE_POWER_IDLE
 	idle_power_usage = 100 //Watts, I hope.  Just enough to do the computer and display things.

code/modules/power/gravitygenerator_vr.dm

@@ -24,6 +24,7 @@ GLOBAL_LIST_EMPTY(gravity_generators)
 	icon = 'icons/obj/machines/gravity_generator.dmi'
 	anchored = TRUE
 	density = TRUE
+	unacidable = TRUE
 	use_power = USE_POWER_OFF
 	var/sprite_number = 0
 

code/modules/power/singularity/emitter.dm

@@ -7,6 +7,7 @@
 	icon_state = "emitter"
 	anchored = FALSE
 	density = TRUE
+	unacidable = TRUE
 	req_access = list(access_engine_equip)
 	var/id = null
 

code/modules/power/smes.dm

@@ -12,6 +12,7 @@ GLOBAL_LIST_EMPTY(smeses)
 	icon_state = "smes"
 	density = TRUE
 	anchored = TRUE
+	unacidable = TRUE
 	use_power = USE_POWER_OFF
 	circuit = /obj/item/weapon/circuitboard/smes
 	clicksound = "switch"

code/modules/power/solar.dm

@@ -13,6 +13,7 @@ GLOBAL_LIST_EMPTY(solars_list)
 	icon_state = "sp_base"
 	anchored = TRUE
 	density = TRUE
+	unacidable = TRUE
 	use_power = USE_POWER_OFF
 	idle_power_usage = 0
 	active_power_usage = 0

code/modules/power/supermatter/supermatter.dm

@@ -55,6 +55,7 @@
 	layer = ABOVE_MOB_LAYER // So people can walk behind the top part
 	density = TRUE
 	anchored = FALSE
+	unacidable = TRUE
 	light_range = 4
 
 	var/gasefficency = 0.25