Update subsurface commit to include androidhelper.

Signed-off-by: Venkatesh Shukla <venkatesh.shukla.eee11@iitbhu.ac.in>
Changed icon, updated name and navigation

Home as up enabled in settings.
Name changed to Subsurface Android Downloader
Icon changed to subsurface icon.

Signed-off-by: Venkatesh Shukla <venkatesh.shukla.eee11@iitbhu.ac.in>
Added GNU public license file

Signed-off-by: Venkatesh Shukla <venkatesh.shukla.eee11@iitbhu.ac.in>