use OS sleep instead of polling to reduce CPU usage

See merge request postmarketOS/buffybox!31

specify scdoc as a native dependency instead of a runtime dependency

See merge request postmarketOS/buffybox!30

without this lvgl never releases the CPU, and just pegs one of the cores
to 100%. see
<https://github.com/lvgl/lvgl/blob/master/docs/porting/timer_handler.rst>

unify build systems of buffyboard and unl0kr

See merge request postmarketOS/buffybox!29

Make /usr/share paths comply with FHS

See merge request postmarketOS/buffybox!28

Load config from /usr/share aswell

Closes #30

See merge request postmarketOS/buffybox!26

buffyboard: Install config file

See merge request postmarketOS/buffybox!25

Testing buffyboard ready for the Debian release I noticed that this
wasn't being installed.

find-sources: Guarantee stable file order

See merge request postmarketOS/buffybox!24

Add Buffyboard Man pages and Unify Build

See merge request postmarketOS/buffybox!23

Add nord themes

See merge request postmarketOS/buffybox!17

Added Adwaita dark theme

See merge request postmarketOS/buffybox!20

Grab screenshots via fbcat to fix colors

See merge request postmarketOS/buffybox!21

iskey: new utility

See merge request !19

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>

iskey tells you if any of a given list of keys are pressed on any input
device in the system.

e.g.

$ iskey KEY_VOLUMEDOWN

Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>