[shifty] add submodule
[shifty] remove old version
Config change for 3.5

mainly inspired from default /etc/xdg/awesome/rc.lua and example.rc.lua
from shifty. Needs cleaning
[shifty] change configured apps

- openoffice is replaced by libreoffice
- add vlc
[theme] change default color for normal text

fix a problem when a tag is added with shifty, text was the same colour
as background