Deprecation of GoodData Writer v2

The old version of GoodData Writer (v2) was already unpublished a few months ago and does not allow you to create new configurations since then. Now the time has come to deprecate the component entirely and set a date for its final shut down. 

The date is September 31, 2019, so you are encouraged to migrate old configurations until then. The ui shows a deprecation notice and offers you to run the migration process.