Json ship definitions

# Description:
This one comes directly from the [Roadmap](http://pioneerwiki.com/wiki/Roadmap) drawn up somewhere back in the mists of time.

Convert all of the ship and station definitions into JSON format from Lua so that we can avoid using Lua in the main thread to load them.

# Todo:
- [ ] Handle older Lua style files until everyone has transitioned by saving them out as JSON.
I already have the code for this in there, it's just not hooked up and all of the relevant craziness isn't done yet.

Andy