Start to use ship ids for comparison

[DoumanAsh]

If we assume that id is unique it is sufficient to compare ships by their ids.

Question is, though, do we need it? I didn't look too much into code, but i assume mostly in Sunrider we're copying around references to ships or is there place where we need a actual comparison?

By default if there are no such methods Python compares objects by addresses

[vaendryl]

I don't really think this is required and just ads more complexity in which things can go wrong

[DoumanAsh]

Ok, I think you can actually remove it as it is not really used, at least at first glance