Macro dbus_macros::dbus_class

macro_rules! dbus_class {
    ($interface_name:expr, class $class_name:ident { $($functions:tt)* }) => { ... };
    ($interface_name:expr, class $class_name:ident ($($variables:ident : $variable_types:ty),*) { $($functions:tt)* }) => { ... };
}