Unique sound and magazine sprite for XM43E1

[Releasethesea]

About the pull request

adds a unique sound and magaqine sprite to the XM43, this allows the rifle to be more easily distinguished

Explain why it's good for the game

being able to tell the difference between the AMR and normal sniper without hearing it is annoying, now you can tell at a glance due to having different magazine sprites, as for the sound, i think its good to have a difference between the PMC M42C and XM43E1

Testing Photographs and Procedure

Screenshots & Videos

Put screenshots and videos here with an empty line between the screenshots and the <details> tags.

https://imgur.com/a/r8hGerO (sprites)

https://files.catbox.moe/8zb5nx.ogg (sound)

Changelog

🆑
add: Adds unique sound and magazine sprite to the XM43E1
/:cl:

[nauticall]

Not enough visual difference between the standard sniper mag and the XM43 - from a distance they are exactly identical.

Try copying the color palette from the XM itself and then notice the length of the magazine and of the caliber (10x99) - make the magazine wider as a result and maybe adjust the color to brown and blue.

[github-actions]

This PR has been inactive for long enough to be automatically marked as stale. This means it is at risk of being auto closed in ~ 7 days, please address any outstanding review items and ensure your PR is finished, if these are all true and you are auto-staled anyway, you need to actively ask maintainers if your PR will be merged. Once you have done any of the previous actions then you should request a maintainer remove the stale label on your PR, to reset the stale timer. If you feel no maintainer will respond in that time, you may wish to close this PR youself, while you seek maintainer comment, as you will then be able to reopen the PR yourself