Use cmake based build configuration

Signed-off-by: Simon Busch <morphis@gravedo.de>
Rewrite most parts of the README

Signed-off-by: Simon Busch <morphis@gravedo.de>
Pack QML resources into the executable

Signed-off-by: Simon Busch <morphis@gravedo.de>
Set correct QT_QPA_PLATFORM platform and check for XDG_RUNTIME_DIR

Signed-off-by: Simon Busch <morphis@gravedo.de>