Plex-mpv-shim

This release:
- Make external MPV playback more tolerant of startup failures.
- Add logging for external MPV troubleshooting.

Previous (non-windows point releases):
- Fix an issue where older MPV versions do not work with external MPV.
- Isolate pystray into separate process to avoid Segmentation Fault on Linux.
- Set external MPV as the default player backend on OSX.
- Enable "forkserver" fix for OSX crashes.

This release fixes a regression where enabling external player support results in a crash at startup.

This release contains bugfixes and minor features.

- Add the ability to disable the MPV on-screen controller.
- Handle end of playback properly.

This release fixes issues with the menu and with autoplay in the new external MPV JSONIPC mode.

This release adds support for using an external MPV instead of `libmpv1`. If `libmpv1` is not available, the player will automatically try to use an external copy of MPV. You can also configure the player to control another instance of MPV that isn't directly managed. (Please note that this does not work as expected with SMPlayer. You can control the player, but there is a lot of unusual behavior.)

This new functionality is made possible by [python-mpv-jsonipc](https://github.com/iwalton3/python-mpv-jsonipc), a new library similar to python-mpv that allows controlling of MPV via JSON IPC instead of using the C API.

This release contains minor features/bug fixes:

- Prevent integrated menu not appearing.
- Add media key support for Windows. (11)