Updates the proximity monitor component (#15836)

* prox component update

* mochi review

* bug fix, makes proximity sensors always active

* GC fixes and removes an unused proc

* Disposal fixes from TM

* fixes runtimes when objects created in nullspace runtimes, fixes portable flasher

* a fresh perspective

* lewcc review

* adds comment about direct loc setting over forceMove

code/modules/recycling/disposal.dm

@@ -804,6 +804,8 @@
 			for(var/atom/movable/AM in H)
 				AM.forceMove(T)
 				AM.pipe_eject(direction)
+				SEND_SIGNAL(AM, COMSIG_MOVABLE_EXIT_DISPOSALS)
+
 				spawn(1)
 					if(AM)
 						AM.throw_at(target, 100, 1)
@@ -819,6 +821,8 @@
 
 				AM.forceMove(T)
 				AM.pipe_eject(0)
+				SEND_SIGNAL(AM, COMSIG_MOVABLE_EXIT_DISPOSALS)
+
 				spawn(1)
 					if(AM)
 						AM.throw_at(target, 5, 1)