Assigning actions

This ticket adds support for assigning ...Action to a specific user (SysUser), user group (SysGroup) or any other SID for that matter.

public abstract class AbstractAction ... {
 @ManyToOne
 @JoinColumn(nullable = true, ...)
 private AclSid assignee;
 ...
}

ActionFilter should allow for filtering by assignee.

UI

Include Assignee in all action tables, forms and search filters. Filtering uses the same approach as modifiedBy:

Add support to select multiple actions and "Assign selected actions" to some SysUser or SysGroup.