[cuegui] Fix CueGUI version handling and improve error handling #1538
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cuegui/cuegui/Constants.py
to avoid repetition and improve readability.__get_version_from_cmd
function.cuegui/tests/Constants_tests.py
whencuegui.use.custom.version
is TruedisplayAbout
method inMainWindow.py
to explicitly check forOPENCUE_BETA
environment variable.