It's working

Hello @greenarrow 

I have noticed you had not finished the plugin, but were far ahead in the implementation, so I took some time to implement it :smile: 

I had a little bit of trouble porting it to new versions of Totem and Gtk but in the end it's working fine. I still need to move the timeout config to the config box but functionality is ok now.

Thanks for doing the hard work on the watch and countdown to the playlist