Fixes #267.

From PRs by @pupi1985 (unmergeable due to file structure changes).
Closes #69.
Closes #126.

No longer selects multiple items when URLs are substrings of other URLs

Set to Unix line endings in repo; the gitattributes file means they
will be converted to suit the user’s system.

Debugging functions converted to use Usage.
String class not yet in use.

Includes sitemap plugin