2.91.7: * Allow finer-grained control on the volume using Shift as a modifier * Add Zeitgeist provider plugin * Don't crash if plugins weren't loaded * Update work area code * Update for latest libpeas changes * Make default plugins dialogue bigger * Fix saving localised strings in the chapters CMML files * Fix vanishing entries when loading mixed media types from slow links * Fix screensaver not disabling when switching to fullscreen straight away