trainship hijack deathmatch map (#82933)

adds the Trainship Hijack deathmatch map

it is a few flying trains in Tizira being boarded and stuff by cowboys
its pretty cool i think

also allows changing turf reservation type of lazy templates

code/datums/lazy_template.dm

@@ -15,6 +15,8 @@
 	var/map_name
 	/// place_on_top: Whether to use /turf/proc/PlaceOnTop rather than /turf/proc/ChangeTurf
 	var/place_on_top = FALSE
+	/// type of turf reservation
+	var/turf_reservation_type = /datum/turf_reservation
 
 /datum/lazy_template/New()
 	reservations = list()
@@ -62,6 +64,7 @@
 		width,
 		height,
 		parsed_template.parsed_bounds[MAP_MAXZ],
+		reservation_type = turf_reservation_type,
 	)
 	if(!reservation)
 		CRASH("Failed to reserve a block for lazy template: '[key]'")

code/modules/deathmatch/deathmatch_mapping.dm

@@ -13,3 +13,15 @@
 
 /area/deathmatch/teleport //Prevent access to cross-z teleportation in the map itself (no wands of safety/teleportation scrolls). Cordons should prevent same-z teleportations outside of the arena.
 	area_flags = UNIQUE_AREA | ABDUCTOR_PROOF | EVENT_PROTECTED | QUIET_LOGS
+
+// for the illusion of a moving train
+/turf/open/chasm/true/no_smooth/fake_motion_sand
+	name = "air"
+	desc = "Dont jump off, unless you want to fall a really long distance."
+	icon_state = "sandmoving"
+	base_icon_state = "sandmoving"
+	icon = 'icons/turf/floors.dmi'
+
+/turf/open/chasm/true/no_smooth/fake_motion_sand/fast
+	icon_state = "sandmovingfast"
+	base_icon_state = "sandmovingfast"

code/modules/deathmatch/deathmatch_maps.dm

@@ -15,7 +15,7 @@
 	var/list/allowed_loadouts = list()
 	/// whether we are currently being loaded by a lobby
 	var/template_in_use = FALSE
-		
+
 
 /datum/lazy_template/deathmatch/ragecage
 	name = "Ragecage"
@@ -175,3 +175,15 @@
 	)
 	map_name = "ragin_mages"
 	key = "ragin_mages"
+
+/datum/lazy_template/deathmatch/train
+	name = "Trainship Hijack"
+	desc = "Trouble stirs in Tizira..."
+	max_players = 8
+	allowed_loadouts = list(/datum/outfit/deathmatch_loadout/battler/cowboy)
+	map_name = "train"
+	key = "train"
+	turf_reservation_type = /datum/turf_reservation/indestructible_plating
+
+/datum/turf_reservation/indestructible_plating
+	turf_type = /turf/open/indestructible/plating //a little hacky but i guess it has to be done