Add a menu option to reset players
Fix caps for the videorate filter
Update translations
Make the seek bar jump to the clicked position

For that we need to add glue functions on libcesarplayer so the Gdk
Event can be modified. The union GdkEvent is not mapped, every access
is done through glue functions on gtk-sharp, we need to do the same
but for setting the button value.
Make the seek bar behave correctly

When mouse's main button is clicked the video jumps to the pointed position
We adapt the seek bar to work continuously so we can handle press/release/value-changed
set of signals instead of the adjust bounds.
Use regular queues that do not emit buffering messages
test-capture: quit app closing the gtk window
Cast max-bytes to guint64 correctly
fix typo