fix buffering issue by directly downloading image #584
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The current implementation can lead to buffering issues, when four images are taken.
Currently, a connected camera is triggered four times and afterwards the four images are downloaded.
This only works if the connected camera supports having four images in the buffer. This is actually not the case for many consumer camera models, since they were not made for buffering images after an external trigger.
This probably caused the error in #184.
I also noticed this issue on the Sony Alpha 7 3.
This solution directly downloads and processes an image after it's been triggered, so only one image a time needs to be stored on the camera.