updates and fixes mounted guns, makes the example weapon more usable

[carda-sometimesknownas-paxilmaniac]

About The Pull Request

Fixes multiple aspects of mounted guns that were broken in some way or another, such as being unable to complete click actions on the weapon in any way while it was mounted.
Gives mounted guns some new features, such as throwing casings aside to reduce incidents of giant piles of casings underneath the weapon.

Updates the example weapon to something higher quality to strive for, the Yanao tripod machinegun from a prior PR that I'm atomizing.

2026-08-13.23-50-38.mp4

Why It's Good For The Game

Code working as intended is usually better for the codebase.
Right now the example for mounted guns isn't very usable and doesn't really demonstrate what all the component for mounted weapons can do. The tripod machinegun should better demonstrate what can be done with the system to prospective contributors.

Changelog

🆑
add: Adds the Yanao tripod machinegun as a better example to represent what the mounted weapons system is capable of
qol: Weaponry can now eject casings in a direction rather than directly under the shooter, if desired
fix: Fixes multiple bugs with mounted guns
/:cl:

[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