Don't use relative imports like `../foo.h` as those depend on the
relative position of both files. Rather than that use imports relative
to the `src` directory, which explicitly is part of the include
directories.

* Improve stopwatch more

* Make sure sleep gets reenabled

* Cleanup and clang-format

msec => hundredths

new navigation
add some color to the apps
redesign menus
new settings menu
new quick settings
code clean up
size reduction by converting navigation images to font
and more...