High-level rendering engine with multiple backends. This project is a work in progress and is very incomplete. Pardon the dust!
```rust let mut front = Frontend::new(...); let mut back = Backend::new(...);
let data = PersistentData { ... }; let handles = back.loadpersistentdata(data);
loop { let frame = Frame { ... }; let ir = front.process(frame); back.process(ir); } ```