Steam-acolyte

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- bugfix: exception when clicking "Exit Steam" menu item
- bugfix: possible crash at program exit when closing via menu

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- bugfix: failing to restart steam, waiting indefinitely
- add ``--logfile`` option to redirect steam output
- add ``--verbose`` option to print debug messages
- require pyinstaller 3.6
- some internal code improvements

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- maintenance release with no code changes: fixup AUR version format

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- maintenance release with no code changes: automate AUR package update

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- built windows exe against newest pyqt
- migrate builds to github actions

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- add menu item for shutting down steam
- add menu items for direct user switching without showing the GUI