Windows: setting style from environment variables.

[StrongTheDev]

I'm having a use case where i am avoiding use of the build script - because compilations are slower; and I have been trying to get styles working without need of a build script.

In my app I use the slint!{ } macro - making compilations a bit faster.

With that small detail in mind, I have been trying to add styling using environment variables; since it's already available in the python version, couldn't it be nice to add it to the Rust version too?

fn main() -> Result<()> {
    unsafe {
        env::set_var("SLINT_BACKEND", "winit-software"); // this works
        env::set_var("SLINT_STYLE", "material-dark"); // this does not work
    };
    ...
}

From the code above, the SLINT_BACKEND environment variable works (i am using the software renderer because femtovg seems to lack anti aliasing - but that's not the point); but the SLINT_STYLE doesn't.

Wouldn't that be a great addition to use the SLINT_STYLE as well?