[processing] Harmonize DXF Export app dialog and corresponding algorithm (Request in QGIS)

[qgis-bot]

Request for documentation

From pull request qgis/QGIS#57200 Author: @gacarrillor QGIS version: 3.38

[processing] Harmonize DXF Export app dialog and corresponding algorithm

PR Description:

Follow-up: https://github.com/qgis/QGIS/pull/56147

• Remember settings for data defined blocks in DXF Export app dialog
• Expose DXF Export's data defined blocks functionality to processing

Fix https://github.com/qgis/QGIS/issues/56853

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Funded by the QGIS user group Switzerland.

Commits tagged with [need-docs] or [FEATURE]