The camera driver will now upload the exposure time when it's called from a scan object.
The output function now returns events which are not targeted at the camera or SICS
so that they can be fed back into the state transition function.
The input event handler (camera.c:camdriv_input) now feeds output events back into the
transition function.
Takes a single shot or a multishot.
If the user changes the camera configuration in SICS the new config will
be uploaded when the next take shot/multishot command is sent.
This driver allows the scan object in SICS to drive the scan variable to
the next target while the camera is processing and saving data after
acquiring an image.
TODO
Implement "set file,..." command.
