fdo#74847 Add pointer feature to android impress remote.

Now you can use pointer in android impress remote.
To start the pointer click on menu option to see "start pointer".

Change-Id: Ie1b283fa67dfdb3e6556f20fd1796fb27763fe9f
Reviewed-on: https://gerrit.libreoffice.org/8438
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
Tested-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>