For whatever reason most of the files had their permission
changed from 644 to 755, which is not wanted.

 -- Note that max line length is 200 (maximum allowed by tool)
 -- Pre-commit hook tested and uses the same option file as CI

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

adding a client-side pre-commit script. This script needs to be installed by every developer manually. see comments in script.