#3194 Awarding non-stackable medals to multiple people

[jackreichelt]

This fixes #3194. Allows selecting multiple personnel and awarding a non-stackable award, which will only be added to those who do not already have it. When a single person is selected, the awards list will still be filtered as normal.

[jackreichelt]

Potentially this should still hide a non-stackable award from the list if everyone already has it. Can definitely implement that, but I'd love some feedback on if that's better UX. I am uncertain.

[JonhyBurner]

Since single personnel awards menu hides the non-stackable that person already has, hiding it when choosing multiple personnel when everyone has it would be the expected behaviour for a user. In practice, it makes no difference, though.

[jackreichelt]

After sleeping on it, I think that not hiding the award if all of a selected group already have it is better. My rationale is that if you do hide it, people have to scroll, not see it, then double-check they haven't missed it. The list is quite long, so I think it's easy to miss things.

If you don't hide it, then when you apply it to a group, it's a simple process, with a guarantee at the end that all the selected personnel have the award (even if they had it all already).

A potential future change might be to merely disable an award in the menu, but still show it. This just helps preserve the list contents regardless of state/selection, which might make it more intuitive. But I think that's a very minor improvement, that might not be worth it.

[rjhancock]

Changes look sane.