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* MKVToolNix GUI: multiplexer: when reading color parameters from identified files that are floating point numbers (minimum/maximum luminance, projection pitch/roll/yaw) the numbers will be formatted in floating-point notation instead of scientific notation as mkvmerge only supports the former. * mkvmerge: AV1 OBU parser: fixed identifying files that only contain single frame. * MKVToolNix GUI: when adding directories via drag & drop/copy & paste the GUI will now offer the user the option to create one multiplex settings tab per directory & adding all files from that directory to the corresponding, newly created tab. If you only want to relocate the preferences INI file, you can store the desired file name for the INI file in `MKVTOOLNIX_GUI_CONFIG_FILE`. If set, the variable `MKVTOOLNIX_GUI_STATE_DIR` can point to a directory where the GUI stores both the job queue sub-directory and the preferences INI file.
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* MKVToolNix GUI: the user can now control where the job queue files & the preferences INI file are stored via environment variables.
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