Streamdeck

Initial release.

- Added support for the StreamDeck Plus.

- Updated Windows HIDAPI backend to attempt to load from the local working directory.
- Added detection for MacOS Homebrew installations of the libhidapi back-end library.

- Added support for a new sub-variant of the StreamDeck XL.

- Added support for a new sub-variant of the StreamDeck Mini.

- Transport errors now trigger a closing of the underlying StreamDeck device, so further API calls will throw correctly (and ``is_open()`` will return ``False``).
- Updated animated example script to use separate cycle generators for each key, so the animations play at the correct rate regardless of key count.
- Added support for the StreamDeck pedal.
- Added new `is_visual()` function.