fdo#84909 enable start from current slide and add its tango icons

Change-Id: I2af37e19f5f54557415b80d9aad2bba38d381a87
Reviewed-on: https://gerrit.libreoffice.org/13462
Reviewed-by: Yousuf Philips <philipz85@hotmail.com>
Tested-by: Yousuf Philips <philipz85@hotmail.com>