Multimedia keys found on certain presentation clicker devices.
Not added to the Customize dialog, as that was not yet asked for.
As I have no access to a MAC, did not add support for that in vcl.
Inspiration for code taken from
commit ca74511985
Change-Id: I417e6ba7e79c5f6e774a56ba747803a156d5f50f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/160255
Tested-by: Thorsten Behrens <thorsten.behrens@allotropia.de>
Reviewed-by: Thorsten Behrens <thorsten.behrens@allotropia.de>
