Fix multiplayer desyncs related to the Loadout manager

[JonM0]

Changes

• sync Loadout using its uniqueID instead of its index in the Loadout list
  • had to make public reading the uniqueID and getting a loadout by id, as the multiplayer sync workers live in another dll
• sync loadout label on every label change instead of on current loadout change or window close

Reasoning

Tested it a bit, and it seemed the desyncs were related to a combination of:

• label sync is infrequent
• the loadouts are synced by index
• the loadouts are sorted by label

Testing

Check tests you have performed:

• Compiles without warnings
• Game runs without errors
• (For compatibility patches) ...with and without patched mod loaded
• Playtested a colony (specify how long)

[github-actions]

You can download the rebuilt assembly for this PR here: https://combatextended.lp-programming.com/CombatExtended-12754302182.zip