Insert break opportunities in URIs shown for print

[mojavelinux]

If unbroken, URIs can disrupt text justification or and line wrapping by leaving behind large gaps. When URIs are shown for print (media=print or media=prepress), insert break opportunities in the URI so that it flows more naturally.

Add break opportunities at the following locations:

• After each forward slash following a path segment (but not after the URI scheme)
• After the ? that begins the query string
• After each & in the query string
• After the # that begins the fragment identifier

Don't insert a break opportunity before the last character.

We may even want to think about doing this for all visible URIs in the text (at least ones that match as a link in AsciiDoc).

[mojavelinux]

To clarify, this is done for any visible URI that's specified as part of a link, regardless of media type.