Changes

Make action methods replaceable
Conflicts:
org.eclipse.scout.rt.client/src/main/java/org/eclipse/scout/rt/client/ui/basic/table/organizer/OrganizeColumnsForm.java 
Change-Id: I4635c4053f9e2c52c84e281e48c7ca4d4d781295 Reviewed-on:
https://git.eclipse.org/r/152469 Reviewed-by: Thomas Siegrist
<thomas.siegrist@bsi-software.com> Tested-by: Ivan Motsch
<ivan.motsch@bsiag.com> Tested-by: CI Bot