- Modify Etherpad and SharedVideo so their resizing takes into account
the width of the filmstrip in vertical filmstrip mode.
- Modify Filmstrip's getFilmstripWidth to account for when the filmstrip
is hidden.
- modify VideoContainer so in vertical filmstrip mode it centers the
shared desktop stream in the middle of the available space not taken
by filmstrip.
- Also allow clickthrough on the secondary toolbar itself while still
allowing clicks on the toolbar's buttons. This allows clicks on
shared videos to go through.