Change all license headers to comply with REUSE specification.
Fix #16132
Co-authored-by: flynnnnnnnnnn <flynnnnnnnnnn@github>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>
* move Setting function into its own package
* swagger add&use new section "settings"
* move api AllowedReactions into general UI-Settings endpoint
* prepare TEST
* lint