Steam-acolyte

- fix UnicodeDecodeError on systems with a preferred encoding different from
UTF-8 (13)

- add workaround for trayicon not showing in plasma (8)
- AUR package: fix incorrect usage of Version entry in desktop file
- AUR package: install desktop icon to /usr/share/pixmaps
- AUR package: rename desktop app to "Steam Acolyte"

- fix exception due to case-sensitive handling of steam config files (10)

- no longer modify/replace config.vdf (see 28)
- remove obsolete "logout" button
- the files in ``steam/acolyte/*/config.vdf`` that were created by
previous versions of the program no longer have any purposes

- add command line option ``--prefix`` to better support flatpack steam
- try to autodetect whether to use the default, native, or the flatpack
version of steam (unreliable)

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