Steam-acolyte

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- store current login on program start
- show a tray icon to inform users when acolyte is running
- fix an issue where the mouse hover effects stop working after hiding and
showing the window
- trigger buttons when mouse is released, not already when pressed. This
better emulates normal button behaviour
- highlight button being pressed in a different color

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- fix deadlock on windows after running steam
- fix file descriptor leakage on linux after running steam

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- fix AttributeError due to missing os.sched_yield on windows
(actually merge the fix intended for the previous release this time;)

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- fix AttributeError due to missing os.sched_yield on windows

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- fix OSError on startup if a process with the given PID exists but the pipe
is not currently writable (linux)
- address an unlikely race condition during program startup
- call activateWindow only a single time on the first acolyte window, when a
second steam/acolyte is started

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- fix broken usage of single-acolyte-instance-lock