Document changes and release 0.22.0

See merge request !104

It makes no sense for upstream packaging to be quilt-based, and the patch
was broken too, so get rid of it and make the package native.

Only reset current_control when touching the control area

See merge request !102

Reduce MAX_VIDEO_BUFFERS to 5

Closes #65

See merge request !101

Otherwise we end up setting current_control to USER_CONTROL_NONE
at any tap outside of the control area, even though the controls
stay visible on the screen.

20 buffers of 13MP image is about 250MB, which is a lot to demand
from CMA. We don't need so many buffers, so reduce the number to 5.
This reduces the lag when switching between cameras, modes and even
makes the selfie camera's viewfinder react significantly faster.

Fixes #65

Add a postprocessing utility to replace dcraw/convert/exiftool

Closes #64

See merge request Librem5/millipixels!98

mpegize: Handle audio in a single pass

See merge request !99

Enable automatic WB and focus by default

See merge request !95

Reduce the burst length to 2

See merge request !97

UI fixes for Auto modes

See merge request !92

Don't let the slider value affect another control when switching

Closes #76 and #74

See merge request !94

io_pipeline: Take WB into account when determining has_changed's value

See merge request !93

Set the default white balance preset back to D50

See merge request !91

There's no reason to change the audio container and copy it
around, the raw file can be fed directly to ffmpeg that does
the final output file.

This dramatically reduces processing time. The resulting photos
and videos are 50% the original resolution, but since we were
already using linear interpolation to make processing faster
the loss of quality shouldn't be very noticeable. In case of
photos, there's also the original DNG retained which can be
used to high quality processing afterwards.

Fixes #64

Heavily based on postprocessd: https://git.sr.ht/~martijnbraam/postprocessd

Our postprocess.sh only takes the second frame into account,
while thumbnail code for "open photo" button uses the last
frame from the burst. Since we're not really using the burst
functionality anyway, reduce the burst length to 2 and make
the thumbnail match the resulting photo.

This may be worth revisiting once something actually makes
use of the burst feature (postprocessd perhaps?)

Setting a new lower/upper values could trigger on_control_slider_changed
when current_control has already been set to a new value, causing
the newly selected control to be set to bogus values.

This fixes the UI state not being updated after WB has been adjusted
automatically.

There's no reason to let the user fiddle with the slider when it's
supposed to be under the application's control. Make it less confusing
and make the slider insensitive when auto mode is enabled.

Gain and exposure already did it properly, but WB and focus always set
the button to inactive. Fix it.

Commit 2ba8caf1 added a new WB preset,
but didn't adjust the default value at application launch. Fix it now.

Fix UI crashes

See merge request !89

config/librem5: update calibration matrices

See merge request !88

Release 0.21.0

See merge request !87

Video recording functionality does not degrade gracefully if they are not present. It just fails without any user-friendly indication as to what went wrong. To prevent confusion, we make it impossible to run into this situation from the packaging point of view.

Stop spamming

See merge request !85

Removes DQBUF spam

See merge request !86

Add a WB preset to match Librem 5's torch LED

See merge request !84