Auto Future
a means for easily building futurable structs

This is for quickly making structs futurable, where the future implementation is an underlying async fn.

See this example for details ...

```rust use ::auto_future::AutoFuture;

struct ExampleStruct;

impl ExampleStruct { async fn doasyncwork(self) -> u32 { // perform a bunch of awaited calls ...

  123
}

}

impl IntoFuture for ExampleStruct { type Output = u32; type IntoFuture = AutoFuture;

  fn into_future(self) -> Self::IntoFuture {
      let raw_future = self.do_async_work();
      AutoFuture::new(raw_future)
  }

} ```