This commit adds a sidebar deck for comments.
It has all the functionalities of the old comments
shown via annotation window.
Change-Id: Ibab0e21a54c097d0f42bddb1d07da74319970135
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/167840
Tested-by: Jenkins
Reviewed-by: Sarper Akdemir <sarper.akdemir@allotropia.de>
