[477928] Optimize delete command availability check

The delete tool availability (diagram, tree, table) is now computed
considering first the precondition of the tool and secondly the delete
authorization (using IPermissionAuthority) of the potential to delete
objects.

Bug: 477928
Change-Id: I34a88ee4793d4aedbe52d66eca0a546af0fe02f3
Signed-off-by: Laurent Fasani <laurent.fasani@obeo.fr>
5 files changed