PEG and other image formats may include an EXIF orientation tag
which indicates in what orientation (rotation and mirroring)
the image should be displayed. libgdk-pixbuf does not correct for this
when loading an image, but provides a function to apply the transform
after the fact, which this commit uses.
Pulled from https://github.com/swaywm/swaybg/pull/68
This implements a simpler version of the wlroots logger for swaylock.
With this logger, the dependency on wlroots can be dropped. This also
adds a debug flag and disables debugging output by default
