lib: add utils module

Signed-off-by: Florian Scherf <fscherf@gmx.net>
config: use lib.utils

Signed-off-by: Florian Scherf <fscherf@gmx.net>
config: add constant MODKEY

This makes it easy to switch all actions to a new modkey

Signed-off-by: Florian Scherf <fscherf@gmx.net>
utils: execute: fix typo

Signed-off-by: Florian Scherf <fscherf@gmx.net>
add license

Signed-off-by: Florian Scherf <fscherf@gmx.net>