Fix exploit with the Copy/Distribute orders feature

[Garanas]

Description of the proposed changes

One can copy the command queue of another unit and append it to the command queue of the units in your selection. In Discord people noticed that this effectively allowed you to copy attack commands that are assigned to units that you no longer have vision over.

That exploit is now fixed.

Testing done on the proposed changes

Have a group of units constantly go in and out of (radar) vision. The orders should only be copied when the attack commands are visible to the player.

Additional context

See the following Discord thread

Checklist

• Changes are annotated, including comments where useful
• Changes are documented in the changelog for the next game version

[Pokute]

Does this affect only order copying/distributing or does this affect issuing attack commands in general?

If latter, then this will very likely affect negatively AI/single player/scenarios.

[Garanas]

This only affects features that rely on the mapping provided in lua/sim/commands/shared.lua, which is only used by the copy/distribute queue orders if I'm not mistaken 😃