Make fighters/drones in ship list UI collapsible

[opusforlife2]

Problem Description

If you have a large number of ships that can carry fighters/drones, then managing the ship list UI becomes a chore, since scrolling is the only way to navigate it, and going through dozens (or maybe hundreds) of fighters/drones just to make one tweak isn't worth it.

Related Issue Links

https://www.reddit.com/r/endlesssky/comments/143x9ww/is_it_possible_to_collapse_drones_and_fighters_in/

#6640 (which has further links to previous closed issues)

Desired Solution

My FR is basically the reddit post title verbatim. If a ship is carrying some drones/fighters, then the ship list UI should let the user collapse their rows into the ship's row.

Maybe a button called Collapse All/Expand All could be added as well.

Alternative Approaches

Drones/fighters being carried by a ship could become 'associated' with it. By this I mean that drag-drop of a ship in the list would cause all its fighters/drones to be moved to the new place simultaneously. Also, while scrolling the list, the game could consider a ship+ its d/fs as a single unit to scroll past, speeding up scrolling into semantically sensible chunks.

This would also allow swapping a d/f between ships that are parked on the same planet.

Additional Context

No response