Portals & hand teleporter (#13266)

* basic system with portals & linked ents

* hand tele sprites, no impl

* hand tele and teleportation works

* fancy it up

* oog

* special case projectiles

* predict portal-to-portal teleportation

* this stuff

* check nullspace

* sloth

* give to rd instead

* i guess this can probably happen

* docs

Resources/Audio/Effects/attributions.yml

@@ -2,3 +2,7 @@
   license: "CC-BY-NC-SA-3.0"
   copyright: "Amateur foley and audio editing by Bright0."
   source: "https://github.com/Bright0"
+- files: ["teleport_arrival.ogg", "teleport_departure.ogg"]
+  license: "CC-BY-SA-3.0"
+  copyright: "tgstation"
+  source: "https://github.com/tgstation/tgstation/commit/906fb0682bab6a0975b45036001c54f021f58ae7"