Add import & export functionality for settings#244

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dateiexplorer wants to merge 5 commits intovoid-linux:masterfrom

dateiexplorer:installer-import-export

Commits on Mar 28, 2022

installer.sh.in: Add inital import and export function
dateiexplorer
committed
installer.sh.in: Add POSTINSTALL to execute script for additional steps after installation
dateiexplorer
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Commits on Mar 29, 2022

installer.sh.in: Improve import & export, add optional flag
dateiexplorer
committed
installer.sh.in: Import & Export: Replace dialog inputbox with fselect
dateiexplorer
committed

Commits on Mar 30, 2022

installer.sh.in: menu_import: Add disclaimer for right usage
dateiexplorer
committed