When select-all was set, input-selector wasn't handling upstream events.
Now input-selector forwards the event to all of its sink pads. This
changes the input-selector internal to camerabin until it is replaced
with a better solution.
The "select-all" property was removed when input-selector was moved
to core, but camerabin uses this, so make camerabin use a private
copy until a better fix is found.
