ref #7268 Avoid multiple warnings for preferences while not connected

ref #7268 Implement own extension point for preferences

Conflicts:¶

eu.etaxonomy.taxeditor.workbench/fragment.e4xmi¶

ref #7234: add possibility to sort named areas by vocabulary order in distribution editor

replace occured by occurred

ref #7063: sort terms by label

ref #7078: set default for sort taxa by rank and name to true

ref #7078: functionality and preference for sort by rank and name in taxon and taxonnode selection

ref #7063: fix gray and checked marks in area tree

ref #7056: add possibility to show preview of the image in media view

ref #7006 Revert opcoach plugin for preferences