Rust bindings for the Godot game engine

Reference-counting and mutability

All non trivially copyable godot types exposed in this crate are internally reference-counted and allow mutable aliasing. In rust parlance this means that a type such as gdnative::ByteArray is functionally equivalent to a Rc<Cell<Vec<u8>>> rather than Vec<u8>.

Since it is easy to expect container types to allocate a copy of their content when using the Clone trait, most of these types do not implement Clone and instead provide a new_ref(&self) -> Self method to create references to the same collection or object.