Fix INVALID_REF errors caused by mods

[ASpoonPlaysGames]

INVALID_REF errors were being caused by trying to get the item image for weapon skins.

If a mod (moreskins) added new skins, the client equipped one, and then the mod is disabled, the client now has bad persistence.
This is mostly handled fine by the game, except for weapon skins. This PR prevents the crash, and resets the bad persistence to default.

Testing:

• Install MoreSkins and equip a weapon warpaint that does not exist in vanilla (example being masterwork for the r201)
• Make sure your persistence has saved (close the game and reopen it, validate that the skin is still there)
• Delete/disable MoreSkins
• Go to the loadout, the weapon should now have Factory Issue equipped

Note: This PR introduces two vanilla files, menu_pilot_loadouts_shared.nut and menu_edit_pilot_loadouts.nut to Northstar.Client/mod/scripts/vscripts/ui, they will need to be committed as Respawn.

[F1F7Y]

Followed instructions and the skin defaults to factory issue even when MoreSkins is enabled:

After disabling the mod:

[ASpoonPlaysGames]

tf... ill look into that tomorrow then

[ASpoonPlaysGames]

Followed instructions and the skin defaults to factory issue even when MoreSkins is enabled:

That looks normal? I probably should've mentioned that the actual gun skin looks like default, it's the icon thing you should be looking at

[ASpoonPlaysGames]

After disabling the mod:

I can't replicate this? Did you have any other mods installed when testing this that might've been causing issues?

[F1F7Y]

I can't replicate this? Did you have any other mods installed when testing this that might've been causing issues?

Flightcore overwrote the folder so i cant check, Ill test it again tho

[ASpoonPlaysGames]

Flightcore overwrote the folder so i cant check, Ill test it again tho

I would normally just add a check to prevent this crash, but this code needs to run, or you'll just get a crash later on. I might throw an error that's a bit more descriptive though

[F1F7Y]

I can't replicate this? Did you have any other mods installed when testing this that might've been causing issues?

Having the masterwork skin selected and going into the "Pilot loadouts" menu with MoreSkins disabled causes this

[ASpoonPlaysGames]

Having the masterwork skin selected and going into the "Pilot loadouts" menu with MoreSkins disabled causes this

Still can't replicate on my end unfortunately

EDIT: ok I can replicate now

[F1F7Y]

Couldn't manage to break it, changes look good

NOTE: Adds vanilla files

[GeckoEidechse]

@ASpoonPlaysGames from which VPK are the files from? ^^

[ASpoonPlaysGames]

@ASpoonPlaysGames from which VPK are the files from? ^^

englishclient_frontend

[F1F7Y]

@GeckoEidechse bump

[uniboi]

please please please the code is good and does what it's supposed to

[GeckoEidechse]

Merging based on past reviews.