Fix/ix: check for deps, changed xclip flag, reformatted

[pvonmoradi]

Also shellcheck complains about line:
--bind 'Ctrl-E:execute:p={1}; edit=$(curl -s "$p" | vipe); ix -i "${p##*/}" <<< "$edit"' \

Expressions don't expand in single quotes, use double quotes for that. [2016] [shellcheck:]

I'm not sure how to fix it.