Fixed bullet trajectories when firing from a vehicle.

[Vitroze]

In connection with this PR and this comment (#357 (comment)), I have created a separate PR.

It is a workaround that works in itself.

However, it does not work with standard Garry's Mod projectiles:

Class Weapon	Addon	Status
weapon_rpg	Base	❌
weapon_slam	Base	❌
weapon_frag	Base	❌
weapon_bugbait	Base	❌
weapon_crossbow	Base	❌
weapon_flechettegun	Base	✅
manhack_welder	Base	✅
weapon_ar2 (Right-click)	Base	❌

I'm saving this PR as a draft. If anyone wants to work on this or if you want to go ahead and push it now, feel free to do so. This PR won't be my priority, but I'll try to work on it as soon as I have some free time.

[StyledStrike]

To be honest I worry that the "override PlayerMeta functions" approach conflicts with other addons doing the same (like seat weaponizer), besides being a thing that saps a little performance for being called in so many places in the game

[Vitroze]

I agree, but I don't see how to make all projectiles and bullet trajectories compatible without overwriting those functions.