Refactors Holodeck to Use Map Templates, Again! Black Magic OOM Crashing No Longer Included (#55645)

Refactors the holodeck to use map templates instead of copy_contents_to, which every maintainer seems to have complaints about.

Fixes #41485 because the matches become part of the spawned list created by ssatoms
Fixes #54789 because the holodeck area no longer has the NO_TELEPORT flag
Fixes #55676 because the map templates cant be changed midround unlike the program copies in the centcom z level
Fixes #49318 because the holodeck no longer creates new areas like the original did

This pr also changes initTemplateBounds to be a /datum/map_template proc instead of a parsed_map proc. This was mainly so I wouldn't have to duplicate vars between map_template and parsed_map. It's also nice because there's no longer a parsed_map proc inside the map_template file, especially when it didn't need to be a parsed_map proc.

The holodeck sims wont take up space in the centcom z level any more (which allows for more possible programs in the future), and map templates are more heavily tested. This is also a chance to future proof the holodeck against bugs. Holodeck also seems more responsive. This should allow for a second custom holodeck in some future ruin as well, although that of course will not be in play for the near future because of the offstation content ban. Also I documented the fuck out of the holodeck

code/modules/mapping/reader.dm

@@ -22,6 +22,9 @@
 	/// Offset bounds. Same as parsed_bounds until load().
 	var/list/bounds
 
+	///any turf in this list is skipped inside of build_coordinate
+	var/list/turf_blacklist = list()
+
 	// raw strings used to represent regexes more accurately
 	// '' used to avoid confusing syntax highlighting
 	var/static/regex/dmmRegex = new(@'"([a-zA-Z]+)" = \(((?:.|\n)*?)\)\n(?!\t)|\((\d+),(\d+),(\d+)\) = \{"([a-zA-Z\n]*)"\}', "g")
@@ -304,6 +307,10 @@
 	//Instanciation
 	////////////////
 
+	for (var/turf_in_blacklist in turf_blacklist)
+		if (crds == turf_in_blacklist) //if the given turf is blacklisted, dont do anything with it
+			return
+
 	//The next part of the code assumes there's ALWAYS an /area AND a /turf on a given tile
 	//first instance the /area and remove it from the members list
 	index = members.len
@@ -474,4 +481,9 @@
 
 /datum/parsed_map/Destroy()
 	..()
+	turf_blacklist.Cut()
+	parsed_bounds.Cut()
+	bounds.Cut()
+	grid_models.Cut()
+	gridSets.Cut()
 	return QDEL_HINT_HARDDEL_NOW