fdo#75256 Improve sifr icontheme

Add new sifr versions of the sidebar icons, add new custom animation and more button for the sidepanel.

Change-Id: I3d10f6d674d20dc63ec307a3efb68e6b172dd9b8
Reviewed-on: https://gerrit.libreoffice.org/12318
Reviewed-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>
Tested-by: Samuel Mehrbrodt <s.mehrbrodt@gmail.com>