[WIP] Automatic Identification System (AIS) transponder equipment

# Forewarned:
I've posted on the forums about my ideas for an [Automatic Identification System](http://pioneerspacesim.net/forum/viewtopic.php?f=3&t=262) so if you want to discuss gameplay implications please do so over there!

Technical and code issues are for here.

# What does this change?:
There are many changes so here is a summary:
* bump the save game,
* add new strings to be translated,
* new LuaShip functions,
* new equipment,
* new equipment _slot_,
* affects things displayed in SystemView and what is displayed in WorldView.

# What still needs to be done:
There's a lot of tidy up work like...
* Change the strings used for the TransponderHackers companies,
* Add buttons to enable/disable the Transponder modes depending on model,
* Improve the Transponder Information screen,
* Add fines for docking with a disabled/fake AIS,
* Need an icon for the ship Transponder Information screen.

Andy