Refactors beams. Adds tethering. IV drips/bags are now tethered. (#29570)

* refactor

* tether

* tetherrrs

* logic fix (i hope)

* ci fix

* ok please work

code/modules/mob/living/simple_animal/hostile/venus_human_trap.dm

@@ -22,8 +22,7 @@
 	anchors += locate(x + 2, y - 2, z)
 
 	for(var/turf/T in anchors)
-		var/datum/beam/B = Beam(T, "vine", time=INFINITY, maxdistance=5, beam_type=/obj/effect/ebeam/vine)
-		B.sleep_time = 10 //these shouldn't move, so let's slow down updates to 1 second (any slower and the deletion of the vines would be too slow)
+		Beam(T, "vine", time = INFINITY, maxdistance = 5, beam_type = /obj/effect/ebeam/vine)
 	addtimer(CALLBACK(src, PROC_REF(bear_fruit)), growth_time)
 
 /obj/structure/alien/resin/flower_bud_enemy/proc/bear_fruit()
@@ -76,8 +75,7 @@
 		for(var/mob/living/L in grasping)
 			if(L.stat == DEAD)
 				var/datum/beam/B = grasping[L]
-				if(B)
-					B.End()
+				qdel(B)
 				grasping -= L
 
 			//Can attack+pull multiple times per cycle