Function register_i64_configuration 

pub fn register_i64_configuration<T: ConfigurationValue<i64>>(
    ctx: &Context,
    name: &str,
    variable: &'static T,
    default: i64,
    min: i64,
    max: i64,
    flags: ConfigurationFlags,
    on_changed: Option<Box<dyn Fn(&ConfigurationContext, &str, &'static T)>>,
)