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Otherwise it's saving 2*image->width bytes of uninitialized memory
image->height times into the DNG file.

Nothing works there anyway.

Fixes #7

Copied from big cam - at least it's better than nothing.

`-H 2` prevents pink artifacts on overexposed areas, `-q 0` makes
processing much faster for negligible quality loss, `-f` gets rid
of maze artifacts.

Our sensors don't implement that.

focus: Save desired value, restore on mode change

See merge request Librem5/megapixels!25

Black level

See merge request Librem5/megapixels!24

Prevents value underflow and allows to extend the resulting
values back to full range, using a lookup table for faster calculation.

io_pipeline: Don't restart streaming on capture if capture mode equals preview mode

See merge request Librem5/megapixels!23

Allows to workaround #9

Show a message when the camera is gone

See merge request dorota.czaplejewicz/megapixels!22

Change ISO/Shutter labels to Gain/Exposure

See merge request dorota.czaplejewicz/megapixels!20

Since this fork isn't mangling the values, let's have the labels
accurately describe what's being shown or adjusted to avoid confusion.

Update packaging

See merge request dorota.czaplejewicz/megapixels!21

Focus slider

See merge request dorota.czaplejewicz/megapixels!18