Changing "col-sx-12" to "col-lg-12"

Or was this a deliberate change, @rarila? if so, I can revert it..
Minor CSS tweaks.
add composer ui package
add to main nav
add to main backend controller
add a view
add the correct parameters
added temp twig template
add some template includes
get nav selection working
start work on composer wrapper
set composer home env variable
check composer file is writable
start work on separate class to handle composer commands
work on creating specific extend controller
added new controller
add overview page
move the old route out of backend
removed additional char
refer to the class wrapper