ACE Arsenal Extended - Arsenal

Cleans up the ACE Arsenal by grouping look-alike gear into a single entry with choices, instead of listing every camouflage and colour variant as a separate item.

• Weapons, uniforms, vests, headgear, backpacks, goggles, night vision and binoculars are grouped by model.
• Pick a gear entry, then choose its camouflage or other options from buttons in a panel, and the arsenal swaps to the matching item.
• Sorting and searching still work, and the group's name is shown next to each item.
• Choices survive loading and saving loadouts, and the Eden editor keeps them too.

No settings and no keybinds. See settings_users.md and keybinds_users.md for the rest of the pack.