Stops unessassary reactions from occurring in plumbing machines (#95125)

## About The Pull Request
This PR stops reactions from occurring in plumbing machines except for 2
- Reaction chamber
- Acclimator

This means you can now have a tank containing welding fuel, carbon &
hydrogen and not worry about them reacting to create oil

## Why its good for the game
- Makes the game run faster. Calling `handle_reactions()` is an
expensive operation and should not be done needlessly
- Makes life for players easier. We don't want chemicals reacting before
they reach the reaction chamber & acclimator and making them obsolete.
It now allows them to do their job properly

**Dependencies**
- #95077
- #95084

After they are merged. Part of their code needs to be rewritten here.

This also deletes the redundant splitter sprite

## Changelog
🆑
qol: except for plumbing reaction chamber & acclimator, no reactions
will occur inside plumbing machines
/🆑

code/game/objects/items/rcd/RPLD.dm

@@ -44,7 +44,6 @@
 			/obj/machinery/plumbing/fermenter = 30,
 			/obj/machinery/plumbing/liquid_pump = 35, //extracting chemicals from ground is one way of creation
 			/obj/machinery/plumbing/disposer = 10,
-			/obj/machinery/plumbing/buffer = 10, //creates chemicals as it waits for other buffers containing other chemicals and when mixed creates new chemicals
 		),
 
 		//category 2 distributors i.e devices which inject , move around , remove chemicals from the network
@@ -62,9 +61,10 @@
 		"Storage" = list(
 			/obj/machinery/plumbing/tank = 20,
 			/obj/machinery/plumbing/acclimator = 10,
+			/obj/machinery/plumbing/buffer = 10,
 			/obj/machinery/plumbing/bottler = 50,
 			/obj/machinery/plumbing/pill_press = 20,
-			/obj/machinery/iv_drip/plumbing = 20
+			/obj/machinery/iv_drip/plumbing = 20,
 		),
 	)