fdo#84909 adding and hiding buttons in standard and common task toolbars

Change-Id: I6690f94fe4a41bb48110ef890301423f7c4328db
Reviewed-on: https://gerrit.libreoffice.org/12359
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>