converts ex_act to legacy_ex_act, plants the seeds for new explosions (#4662)

Co-authored-by: VM_USER <VM_USER>

code/modules/power/singularity/act.dm

@@ -39,7 +39,7 @@
 /obj/singularity_act()
 	if(flags & ATOM_ABSTRACT)
 		return
-	ex_act(1)
+	legacy_ex_act(1)
 	if(!QDELETED(src))
 		qdel(src)
 	return 2

code/modules/power/singularity/collector.dm

@@ -101,7 +101,7 @@ var/global/list/rad_collectors = list()
 	. = ..()
 	. += "The meter indicates that \the [src] is collecting [last_power] W."
 
-/obj/machinery/power/rad_collector/ex_act(severity)
+/obj/machinery/power/rad_collector/legacy_ex_act(severity)
 	switch(severity)
 		if(2, 3)
 			eject()

code/modules/power/singularity/containment_field.dm

@@ -38,7 +38,7 @@
 	if(isliving(bumped_atom))
 		shock(bumped_atom)
 
-/obj/machinery/containment_field/ex_act(severity)
+/obj/machinery/containment_field/legacy_ex_act(severity)
 	return 0
 
 /obj/machinery/containment_field/shock(mob/living/user as mob)

code/modules/power/singularity/particle_accelerator/particle.dm

@@ -72,7 +72,7 @@
 		Bump(A)
 
 
-/obj/effect/accelerated_particle/ex_act(severity)
+/obj/effect/accelerated_particle/legacy_ex_act(severity)
 	qdel(src)
 
 /obj/effect/accelerated_particle/singularity_act()

code/modules/power/singularity/particle_accelerator/particle_accelerator.dm

@@ -140,7 +140,7 @@ So, hopefully this is helpful if any more icons are to be added/changed/wonderin
 		log_game("PACCEL([x],[y],[z]) Was moved while active and turned off.")
 		investigate_log("was moved whilst active; it <font color='red'>powered down</font>.","singulo")
 
-/obj/structure/particle_accelerator/ex_act(severity)
+/obj/structure/particle_accelerator/legacy_ex_act(severity)
 	switch(severity)
 		if(1.0)
 			qdel(src)
@@ -311,7 +311,7 @@ So, hopefully this is helpful if any more icons are to be added/changed/wonderin
 	..()
 	return
 
-/obj/machinery/particle_accelerator/ex_act(severity)
+/obj/machinery/particle_accelerator/legacy_ex_act(severity)
 	switch(severity)
 		if(1.0)
 			qdel(src)

code/modules/power/singularity/singularity.dm

@@ -50,7 +50,7 @@ GLOBAL_LIST_BOILERPLATE(all_singularities, /obj/singularity)
 	consume(user)
 	return 1
 
-/obj/singularity/ex_act(severity, target)
+/obj/singularity/legacy_ex_act(severity, target)
 	switch(severity)
 		if(1)
 			if(current_size <= STAGE_TWO)