- Mixin class was only used with BECDockArea, now it is a class by itself
which represents the client object connected to the GUI server ; ".main"
is the dock area of the main window
- Enhanced "wait_for_server"
- ".selected_device" is stored in Redis, to allow server-side to know
about the auto update configuration instead of keeping it on client
If a logger is given to log `_start_log_process`, the server stdout and
stderr streams will be redirected as log entries with levels DEBUG or ERROR
in their parent process
