New vehicle features functions (setVehicleSpecialFeatureEnabled)

[FileEX]

This PR is the first step toward resolving #1861.

It introduces a new set of functions that allow manipulation of vehicle features. For now, only the water_cannon functionality is supported - additional features will be added in separate future PRs. These functions allow enabling or disabling the water cannon support.

Importantly, the functionality works both on a model level and on specific vehicles - this means, for example, you could implement a system where a firetruck can't use its water cannon if its tank is empty!

It works for both allocated vehicles and vanilla game vehicles.

Syntax

bool setVehicleSpecialFeatureEnabled(vehicle/int modelOrVehicle, string feature, bool enabled)
bool isVehicleSpecialFeatureEnabled(vehicle/int modelOrVehicle, string feature)

Available features:

• water_cannon

[ColombuxMaximus]

Huge W
Aim FOV aswell 🫡

[Fernando-A-Rocha]

Wow, thank you for this contribution!
This fix and addition has been awaited for the past years. I can say that I will continue working on the community resource "newmodels" that is a tool/library to easily manage added models and their features in servers, with full sync.
This feature will be included :)

[Fernando-A-Rocha]

Towing ability for tow truck and other trucks like Roadtrain will be super cool. Afaik for this to work the DFF of the vehicle needs to have a special dummy that is positioned at the tow hitch (where the trailer/vehicle will attach), right?