i3: add bindings for mediakeys and for lxtask (C+A+Esc, as in Windows)
i3: add bindings for mediakeys and for lxtask (C+A+Esc, as in Windows)

dawikur/dotfiles,dawikur/mnl,dawikur/dotfiles,dawikur/mnl,dawikur/mnl,dawikur/dotfiles,dawikur/dotfiles