Reorganizes and splits shuttle code (tgstation#88228)

## About The Pull Request

refer to title

No code changes were made here, i just copypasted code around
The only real difference is that I removed a pretty useless define that
depended on TESTING because it got in my way of splitting emergency.dm

tbh i didnt want a 50k line refactor pr that nobody is going to review
so im getting it out of the way in a separate PR

## Why It's Good For The Game

Shuttle code is literally all over the place please help me oh gosh

## Changelog

Nothing player facing or developer facing (at least I really hope so)

code/__DEFINES/shuttles.dm

@@ -62,6 +62,7 @@
 #define ENGINE_COEFF_MIN 0.5
 #define ENGINE_COEFF_MAX 2
 #define ENGINE_DEFAULT_MAXSPEED_ENGINES 5
+#define ENGINE_START_TIME 100
 
 // Alert level related
 #define ALERT_COEFF_AUTOEVAC_NORMAL 2.5
@@ -120,3 +121,12 @@
 #define SHUTTLE_EVENT_MISS_SHUTTLE 1 << 0
 ///spawned stuff should hit the shuttle
 #define SHUTTLE_EVENT_HIT_SHUTTLE 1 << 1
+
+// Hijack stages
+
+#define HIJACK_NOT_BEGUN 0
+#define HIJACK_STAGE_1 1
+#define HIJACK_STAGE_2 2
+#define HIJACK_STAGE_3 3
+#define HIJACK_STAGE_4 4
+#define HIJACK_COMPLETED 5

code/__HELPERS/shuttle.dm

@@ -0,0 +1,52 @@
+/// Helper proc that tests to ensure all whiteship templates can spawn at their docking port, and logs their sizes
+/// This should be a unit test, but too much of our other code breaks during shuttle movement, so not yet, not yet.
+/proc/test_whiteship_sizes()
+	var/obj/docking_port/stationary/port_type = /obj/docking_port/stationary/picked/whiteship
+	var/datum/turf_reservation/docking_yard = SSmapping.request_turf_block_reservation(
+		initial(port_type.width),
+		initial(port_type.height),
+		1,
+	)
+	var/turf/bottom_left = docking_yard.bottom_left_turfs[1]
+	var/turf/spawnpoint = locate(
+		bottom_left.x + initial(port_type.dwidth),
+		bottom_left.y + initial(port_type.dheight),
+		bottom_left.z,
+	)
+
+	var/obj/docking_port/stationary/picked/whiteship/port = new(spawnpoint)
+	var/list/ids = port.shuttlekeys
+	var/height = 0
+	var/width = 0
+	var/dheight = 0
+	var/dwidth = 0
+	var/delta_height = 0
+	var/delta_width = 0
+	for(var/id in ids)
+		var/datum/map_template/shuttle/our_template = SSmapping.shuttle_templates[id]
+		// We do a standard load here so any errors will properly runtimes
+		var/obj/docking_port/mobile/ship = SSshuttle.action_load(our_template, port)
+		if(ship)
+			ship.jumpToNullSpace()
+			ship = null
+		// Yes this is very hacky, but we need to both allow loading a template that's too big to be an error state
+		// And actually get the sizing information from every shuttle
+		SSshuttle.load_template(our_template)
+		var/obj/docking_port/mobile/theoretical_ship = SSshuttle.preview_shuttle
+		if(theoretical_ship)
+			height = max(theoretical_ship.height, height)
+			width = max(theoretical_ship.width, width)
+			dheight = max(theoretical_ship.dheight, dheight)
+			dwidth = max(theoretical_ship.dwidth, dwidth)
+			delta_height = max(theoretical_ship.height - theoretical_ship.dheight, delta_height)
+			delta_width = max(theoretical_ship.width - theoretical_ship.dwidth, delta_width)
+			theoretical_ship.jumpToNullSpace()
+	qdel(port, TRUE)
+	log_world("Whiteship sizing information. Use this to set the docking port, and the map size\n\
+		Max Height: [height] \n\
+		Max Width: [width] \n\
+		Max DHeight: [dheight] \n\
+		Max DWidth: [dwidth] \n\
+		The following are the safest bet for map sizing. Anything smaller then this could in the worst case not fit in the docking port\n\
+		Max Combined Width: [height + dheight] \n\
+		Max Combinded Height [width + dwidth]")