Runtime Dynamic Station Loading (#24171)

* Dynamic map loading prototype

* Get the title screen working

* Fixes the random pod bugs

* map configs

* Add back the asteroid

* Ignore the rotate file

* Fix some shit

* More shit fixes

* Babby's first json

* Cyberboss confirmed shitcoder

* Makes map rotation great again

* Moves the map defines

* Delete tgstation2.dm

* Convert runtimestation

* Convert PubbyStation

* Convert OmegaStation

* Convert Metastation

* Convert Delta Station

* Lol file extensions

* Reee line endings

* Take out the trash

* Fix loadallmaps.dm

* Deltaassssssstation?

* Fix travis

* Did I ASK you to change the line endings?

* Remove votable maps

* Cleanup

* Previous config. Load configs in New. Fix splash

* Fix this

* More generic minetype

* STOP TOUCHING THE LINE ENDINGS!!!

* Add some flexibility to /obj/screen/splash

* Fix the shit

* Update gitignore

* Smooth transition from last map

* Better check

* Missed this map rotate check

* Remove these checks too

* Prep for a future request by @kevinz000

* Fix z2 line endings

* Solution for custom .dms

* Rename some things, trim some fat

* Fixes default map_config

* Remove stale comment

* Delete the previous config after loading

* Don't try to open a non-existent file

* Delete the old rotator script

* And references to it

* Line endings

* More line endings

* Del checks from when m-config may have not existed

* LINE ENDINGS

* Update the default map config

* Map load error checking for what it's worth

* Small cleanup

* For case sensitive

* File systems

* Strip maprotate stuff from build script

* Spruce up the _maps tree. Compile some empty space

* Make travis simpler

* LINEARU ENDARU!!!

* tgstation TWO!!!

* Lowercase mine type

* Dummy dm's for testmerging

* Fixes job ordering

* If ghosts wanna watch the map load so be it

* Let them know what's going on

* Fixes z-transitions

* Optimize z expansion further

* Remove this old var

* Fix wiznerd teleportation

* Rmove butt

* Does the thing

* Moved temp configs to the data dir

* Un-touch gitignore

* Forgot templates.dm

* Forgot to include the includer

* Fair enough

* SILENCE IMBECILE!

* @Cyberboss still a fuckboi

* Speed things up a bit

* Fix a potential bug with the error message

* Whatever

code/modules/mapping/reader.dm

@@ -25,13 +25,13 @@ var/global/dmm_suite/preloader/_preloader = new
  * 2) Read the map line by line, parsing the result (using parse_grid)
  *
  */
-/dmm_suite/load_map(dmm_file as file, x_offset as num, y_offset as num, z_offset as num, cropMap as num, measureOnly as num)
+/dmm_suite/load_map(dmm_file as file, x_offset as num, y_offset as num, z_offset as num, cropMap as num, measureOnly as num, no_changeturf as num)
 	//How I wish for RAII
 	Master.StartLoadingMap()
-	. = load_map_impl(dmm_file, x_offset, y_offset, z_offset, cropMap, measureOnly)
+	. = load_map_impl(dmm_file, x_offset, y_offset, z_offset, cropMap, measureOnly, no_changeturf)
 	Master.StopLoadingMap()
 
-/dmm_suite/proc/load_map_impl(dmm_file, x_offset, y_offset, z_offset, cropMap, measureOnly)
+/dmm_suite/proc/load_map_impl(dmm_file, x_offset, y_offset, z_offset, cropMap, measureOnly, no_changeturf)
 	var/tfile = dmm_file//the map file we're creating
 	if(isfile(tfile))
 		tfile = file2text(tfile)
@@ -75,7 +75,8 @@ var/global/dmm_suite/preloader/_preloader = new
 			var/ycrd = text2num(dmmRegex.group[4]) + y_offset - 1
 			var/zcrd = text2num(dmmRegex.group[5]) + z_offset - 1
 
-			if(zcrd > world.maxz)
+			var/zexpansion = zcrd > world.maxz
+			if(zexpansion)
 				if(cropMap)
 					continue
 				else
@@ -127,7 +128,7 @@ var/global/dmm_suite/preloader/_preloader = new
 								var/model_key = copytext(line, tpos, tpos + key_len)
 								if(!grid_models[model_key])
 									throw EXCEPTION("Undefined model key in DMM.")
-								parse_grid(grid_models[model_key], xcrd, ycrd, zcrd)
+								parse_grid(grid_models[model_key], xcrd, ycrd, zcrd, no_changeturf || zexpansion)
 								CHECK_TICK
 
 							maxx = max(maxx, xcrd)
@@ -142,10 +143,11 @@ var/global/dmm_suite/preloader/_preloader = new
 		return null
 	else
 		if(!measureOnly)
-			for(var/t in block(locate(bounds[MAP_MINX], bounds[MAP_MINY], bounds[MAP_MINZ]), locate(bounds[MAP_MAXX], bounds[MAP_MAXY], bounds[MAP_MAXZ])))
-				var/turf/T = t
-				//we do this after we load everything in. if we don't; we'll have weird atmos bugs regarding atmos adjacent turfs
-				T.AfterChange(TRUE)
+			if(!no_changeturf)
+				for(var/t in block(locate(bounds[MAP_MINX], bounds[MAP_MINY], bounds[MAP_MINZ]), locate(bounds[MAP_MAXX], bounds[MAP_MAXY], bounds[MAP_MAXZ])))
+					var/turf/T = t
+					//we do this after we load everything in. if we don't; we'll have weird atmos bugs regarding atmos adjacent turfs
+					T.AfterChange(TRUE)
 		return bounds
 
 /**
@@ -165,7 +167,7 @@ var/global/dmm_suite/preloader/_preloader = new
  * 4) Instanciates the atom with its variables
  *
  */
-/dmm_suite/proc/parse_grid(model as text,xcrd as num,ycrd as num,zcrd as num)
+/dmm_suite/proc/parse_grid(model as text,xcrd as num,ycrd as num,zcrd as num, no_changeturf as num)
 	/*Method parse_grid()
 	- Accepts a text string containing a comma separated list of type paths of the
 		same construction as those contained in a .dmm file, and instantiates them.
@@ -253,20 +255,20 @@ var/global/dmm_suite/preloader/_preloader = new
 	//instanciate the first /turf
 	var/turf/T
 	if(members[first_turf_index] != /turf/template_noop)
-		T = instance_atom(members[first_turf_index],members_attributes[first_turf_index],xcrd,ycrd,zcrd)
+		T = instance_atom(members[first_turf_index],members_attributes[first_turf_index],xcrd,ycrd,zcrd,no_changeturf)
 
 	if(T)
 		//if others /turf are presents, simulates the underlays piling effect
 		index = first_turf_index + 1
 		while(index <= members.len - 1) // Last item is an /area
 			var/underlay = T.appearance
-			T = instance_atom(members[index],members_attributes[index],xcrd,ycrd,zcrd)//instance new turf
+			T = instance_atom(members[index],members_attributes[index],xcrd,ycrd,zcrd,no_changeturf)//instance new turf
 			T.underlays += underlay
 			index++
 
 	//finally instance all remainings objects/mobs
 	for(index in 1 to first_turf_index-1)
-		instance_atom(members[index],members_attributes[index],xcrd,ycrd,zcrd)
+		instance_atom(members[index],members_attributes[index],xcrd,ycrd,zcrd,no_changeturf)
 
 		//custom CHECK_TICK here because we don't want things created while we're sleeping to not initialize
 		if(world.tick_usage > CURRENT_TICKLIMIT)
@@ -281,13 +283,13 @@ var/global/dmm_suite/preloader/_preloader = new
 ////////////////
 
 //Instance an atom at (x,y,z) and gives it the variables in attributes
-/dmm_suite/proc/instance_atom(path,list/attributes, x, y, z)
+/dmm_suite/proc/instance_atom(path,list/attributes, x, y, z, no_changeturf)
 	var/atom/instance
 	_preloader.setup(attributes, path)
 
 	var/turf/T = locate(x,y,z)
 	if(T)
-		if(ispath(path, /turf))
+		if(!no_changeturf && ispath(path, /turf))
 			T.ChangeTurf(path, TRUE)
 			instance = T
 		else