Port /tg/ move manager, drift and jetpack components. (#27698)

* Port /tg/ move manager, drift and jetpack components.

* don't add go through newtonian movement if not moved to a turf

* various cleans for blood drifts and mob speed

* fix slow meteors

* why on fuck's earth aren't speedbikes vehicles

* style lint

* also wtf

* okay i'm an idiot

* fix meaty ore speed and blood decal double stepping

* fix not unbuckling pulled object occupants

* don't bother dealing with immovable rods just yet

* exclude bubblegum and vetus from move manager for now

* fix issues related to null weightless blood icons

* reset blood icon state properly

* fuck it, we'll deal with mobs when basic mobs happen

* break infinite loop in decal splat

code/game/objects/effects/effect_system/effects_other.dm

@@ -1,3 +1,59 @@
+/datum/effect_system/trail_follow
+	var/turf/oldposition
+	var/active = FALSE
+	var/allow_overlap = FALSE
+	var/auto_process = TRUE
+	var/qdel_in_time = 10
+	var/fadetype = "ion_fade"
+	var/fade = TRUE
+	var/nograv_required = FALSE
+
+/datum/effect_system/trail_follow/set_up(atom/atom)
+	attach(atom)
+	oldposition = get_turf(atom)
+
+/datum/effect_system/trail_follow/Destroy()
+	oldposition = null
+	stop()
+	return ..()
+
+/datum/effect_system/trail_follow/proc/stop()
+	oldposition = null
+	STOP_PROCESSING(SSfastprocess, src)
+	active = FALSE
+	return TRUE
+
+/datum/effect_system/trail_follow/start()
+	oldposition = get_turf(holder)
+	if(!check_conditions())
+		return FALSE
+	if(auto_process)
+		START_PROCESSING(SSfastprocess, src)
+	active = TRUE
+	return TRUE
+
+/datum/effect_system/trail_follow/process()
+	generate_effect()
+
+/datum/effect_system/trail_follow/generate_effect()
+	if(!check_conditions())
+		return stop()
+	if(oldposition && !(oldposition == get_turf(holder)))
+		if(!has_gravity(oldposition) || !nograv_required)
+			var/obj/effect/E = new effect_type(oldposition)
+			set_dir(E)
+			if(fade)
+				flick(fadetype, E)
+				E.icon_state = ""
+			if(qdel_in_time)
+				QDEL_IN(E, qdel_in_time)
+	oldposition = get_turf(holder)
+
+/datum/effect_system/trail_follow/proc/check_conditions()
+	if(!get_turf(holder))
+		return FALSE
+	return TRUE
+
 /// Ion trails for jetpacks, ion thrusters and other space-flying things
 /obj/effect/particle_effect/ion_trails
 	name = "ion trails"
@@ -8,6 +64,17 @@
 	dir = targetdir
 	QDEL_IN(src, 0.6 SECONDS)
 
+/datum/effect_system/trail_follow/ion
+	effect_type = /obj/effect/particle_effect/ion_trails
+	nograv_required = TRUE
+	qdel_in_time = 20
+
+/datum/effect_system/trail_follow/proc/set_dir(obj/effect/particle_effect/ion_trails/I)
+	I.setDir(holder.dir)
+
+/datum/effect_system/trail_follow/ion/grav_allowed
+	nograv_required = FALSE
+
 //Reagent-based explosion effect
 /datum/effect_system/reagents_explosion
 	var/amount 						// TNT equivalent