Rewrite docking system... again

[fluffyfreak]

Painful it may be but lets face facts the current docking code is some pretty ad hoc shit.

Problems:

• Doesn't handle queuing for docking just rejects ships,
• Doesn't wait until a ship has vacated docking process before granting next ships request - sometimes causes collisions,
• Doesn't timeout ships that fail to dock - it might do but it's a really long timeout,
• Require carefully placed, oriented, named and numbered docking markers per-bay,
• Moves ships by config file defined time steps rather than at a constant speed over the distance,
• Orientation of docking ships seems screwed up for ground stations,
• ...?

There's probably more but they're the immediate issues I can think of from the top of my head.