fix doxygen warning
localize support links
oracle & postgres provider: show progress messages when scanning for available geometry columns
postgres provider: stop using pg column sizes (fixes #7799)
oracle provider: skip dropped tables (fixes #7795)
composer map widget: remove slot for previously removed line width widget
handle bad layer: show unfixable layer count as message bar and skip dialog when list is empty.
fix another doxygen warning
german translation update
Update labeling gui and add expression support as data defined value

- Add QgsDataDefined class
- Add QgsDataDefinedButton class
- Add standalone SVG selector dialog to QgsSvgSelectorWidget class