Un- and register again after renaming

[mflink3012]

Currently the mod will register the teleporting sensors in the TeleporterNetwork, but will not unregister it after changing teleporter.name.

Because the TeleporterNetwork will still hold the object with it's old name, this may lead to problems with

• exchanging names between teleporters (name already in use)
• memory leaks (memory consumption will increase)

So the TeleportingSensor should detect changes in names, unregister itself with the old name and register itself with the new name.

[mflink3012]

Workaround:
Reload the map.