Join a selected set of lines to a comma separated list of items, optionally enclosing each item in a single or double quote.
e.g. select the text
one
two
three
four
five
Join as CSV Ctrl-Alt-j
one,two,three,four,five
Join as CSV with single quotes Ctrl-Alt-Shift-J
'one','two','three','four','five'
Join as CSV with double quotes
"one","two","three","four","five"