Add back path_compatibility.dm

At the request of @RemieRichards

code/__PATH_COMPATIBILITY/path_compatibility.dm

@@ -0,0 +1,21 @@
+/*
+
+	This is a smart+stupid method of maintaining paths during refactors.
+	At this point in time we have more maps than ever, and our tools just aren't that great.
+	So instead of repathing all the maps...
+
+	Keep the old path defined, just as an empty type with that path, and then define it's
+	parent_type as the new path, effectively maintaining the object/mob w/e without having
+	to touch all the maps, avoiding all those nasty conflicts!
+
+	Ideally the old paths would be cleaned out as mappers go about their usual routine of
+	updating old maps.
+
+	tl;dr TYPEFUCKERY, because fuck updating all these maps
+
+	Example:
+
+	/obj/structure/bed/chair/janicart/secway
+		parent_type = /obj/vehicle/secway
+
+*/

tgstation.dme

@@ -70,6 +70,7 @@
 #include "code\__HELPERS\sorts\InsertSort.dm"
 #include "code\__HELPERS\sorts\MergeSort.dm"
 #include "code\__HELPERS\sorts\TimSort.dm"
+#include "code\__PATH_COMPATIBILITY\path_compatibility.dm"
 #include "code\_globalvars\configuration.dm"
 #include "code\_globalvars\database.dm"
 #include "code\_globalvars\game_modes.dm"