[MIRROR] Remove references to old singularity machines (#744)

* Remove references to old singularity machines (#53509)

Removes the singularity generator and the particle accelerator. The former had no sprite, and the latter only existed because of a leftover type path. This does not affect gameplay at all.

Removes the "Start Singularity" verb that was only intended for debug use.

Fixes #53508.

* Remove references to old singularity machines

Co-authored-by: Jared-Fogle <35135081+Jared-Fogle@users.noreply.github.com>

code/modules/power/singularity/generator.dm

@@ -1,35 +0,0 @@
-/////SINGULARITY SPAWNER
-/obj/machinery/the_singularitygen
-	name = "Gravitational Singularity Generator"
-	desc = "An odd device which produces a Gravitational Singularity when set up."
-	icon = 'icons/obj/singularity.dmi'
-	icon_state = "TheSingGen"
-	anchored = FALSE
-	density = TRUE
-	use_power = NO_POWER_USE
-	resistance_flags = FIRE_PROOF
-
-	// You can buckle someone to the singularity generator, then start the engine. Fun!
-	can_buckle = TRUE
-	buckle_lying = 0
-	buckle_requires_restraints = TRUE
-
-	var/energy = 0
-	var/creation_type = /obj/singularity
-
-/obj/machinery/the_singularitygen/attackby(obj/item/W, mob/user, params)
-	if(W.tool_behaviour == TOOL_WRENCH)
-		default_unfasten_wrench(user, W, 0)
-	else
-		return ..()
-
-/obj/machinery/the_singularitygen/process(delta_time)
-	if(energy > 0)
-		if(energy >= 200)
-			var/turf/T = get_turf(src)
-			SSblackbox.record_feedback("tally", "engine_started", 1, type)
-			var/obj/singularity/S = new creation_type(T, 50)
-			transfer_fingerprints_to(S)
-			qdel(src)
-		else
-			energy -= delta_time * 0.5