Unpiloted ships (ghosts) removal by server.

[boreal sequoia]

When players leave their ship it can not just stay.

I suggest one or more of the following options:

• Simply remove it after a time (1 minute?)
• Slowly deteriorate - a block at a time
• Disable flight and weapons - sitting duck.

This should be for any ship, master or subnet player or bot.

• No having a fleet of ghosts roaming the server.
• Every ship must have a pilot (player or bot)

Let's not have the hassle of cleaning up after players when we just want to build.

[vagrant oriole]

we have been gradually moving in this direction, first by destroying ship after all players in a botnet leave and then by destroying ships after all non-bot players in a botnet leave

i'm open to going further if necessary!