Camera config appears not to be read properly after the GUI edits the config file

[emlynjdavies]

(low priority, because work-around is to edit the config file directly when using linux)

When running silcam acquire after editing the config file in the GUI, the camera config part seems to get ignored, and instead reverts to the default camera config.

This might be because some lower-case config parameters are being generated by the GUI writing, which don't get read by the camera correctly - I think the parameters that interact with the camera are case sensitive.

Test this with the hardware in the loop before merging!

[emlynjdavies]

see also #51

[emlynjdavies]

seems that when running from GUI, only the camera config defaults are used. This might have been on purpose due to this bug.