Edit in-game identifiers for DIM loadouts

[bhollis]

This adds the ability to set an in-game identifier (name, color, icon) for a DIM loadout, with the intention that it's used as the default when copying the loadout to an in-game loadout. Fixes #9456. I may decide to feature flag this out until we actually have the ability to copy to an in-game loadout (which will require all kinds of extra UI and warnings and such) which in turn will have to wait until in-game loadouts are re-enabled.

I'm a bit worried that it takes up too much space on mobile, but I'm not sure where else to put it.

[guise]

The size looks good — well balanced for what will essentially be the primary identifier when set.

The header is starting to get a little cosy with all the icons — but it's not unusable imo.

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A potential idea for space-saving: only show the class icon when the loadout tray is opened via an external link or creating a new loadout. The thinking behind this being that in most cases the loadout tray is opened via the class menu or the selected class tile — so you'll always have that context. The downside is that conditional visibility of UI could get confusing.

A more dramatic option could be to pull out the class icon and give it a label. This could allow contextual info to be shown when opening loadouts via a link i.e loadout doesn't match selected class (assuming this has value).

Quick n dirty mockup:

[guise]

Also - I can't remember how the loadout tray behaves when you open a loadout link for a class that you do not have a character for… I remember trying this and being annoyed that I couldn't open the link or something (when I just wanted to inspect the build). Just mentioning this as it might be another case (albeit fringe) that could benefit from showing class info more unambiguously in the loadout tray.

[bhollis]

We don't allow you to open a loadout link that can't be used by one of your characters, so it's probably OK.

[vivekhnz]

Looks good! I'm not sure about the plus icon to edit loadout identifiers, but the game doesn't have a good icon to denote identifiers, so probably ok.

[bhollis]

I'll probably end up having to do something different with how the loadout share works, because we don't auto-select the right class when opening a class-specific loadout.

[bhollis]

I'm leaving this one in limbo until I can get the "save as in-game loadout" button in.