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.
* built timer app
* Style improvements
* making sure buttons stay hidden when the app is reopened and reappear after the timer runs out
* more sensible calculations of time deltas. eliminated that mysterious scaling factor
* changing the timer icon
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...
