Right now util.inspect will always escape single quotes. That is not
necessary though in case the string that will be escaped does not
contain double quotes. In that case the string can simply be wrapped
in double quotes instead.

This reduces the amount of quotes util.inspect escapes by falling
back to backticks in case a string contains single and double quotes.
That makes sure only very few strings have to escape quotes at all.
Thus it increases the readability of these strings.

The string escaping is hard to read. This changes all those escaped
strings to use double quotes instead so no escaping is necessary.