PinCell

This library defines the PinCell type, a pinning variant of the standard library's RefCell.

It is not safe to "pin project" through a RefCell - getting a pinned reference to something inside the RefCell when you have a pinned refernece to the RefCell - because RefCell is too powerful.

A PinCell is slightly less powerful than RefCell: unlike a RefCell, one cannot get a mutable reference into a PinCell, only a pinned mutable reference (Pin<&mut T>). This makes pin projection safe, allowing you to use interior mutability with the knowledge that T will never actually be moved out of the RefCell that wraps it.

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