Steam-acolyte

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- package: fix unexpanded version in desktop file in AUR package

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- package: fix bug in AUR package

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- package: add .desktop entry to AUR package

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- bugfix: another deadlock when stopping or restarting steam

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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