26w34a: Multiplayer, fixes

Client in multiplayer will now save their inventory and other player related data.

Community Suggestion:

• #7965 Blueprints can now include docked ships so carriers, escape pods, and hangars spawn already docked.

Bugfixes:

• Issue when looking at a slider, button, or switch whose linked system is gone.

• #6687 Tutorial: Basic Building Training can be accepted again while already in progress.

• Refuel outpost missions completing immediately after loading and issues when buying back fuel sold to their target station.

• Spaceship HUD speedometer dropping to 0 while a door or other mechanism keeps moving.

• Crash when generating terrain props after entering a new system.

• Issue when hovering some ore items in a storage or command window.

• Issue when a warp or off-screen mission waypoint sits behind the camera or targets another star system.

• Issue when closing the inventory while holding a broken or incomplete item on the cursor.

• Issue when the health HUD updates before the player has fully spawned.

• Issue when autosaving while still loading or before the player has fully spawned.

• Multiplayer: the game now exits to desktop if you lose the connection while joined.

Thanks for playing!