Add options to make first names and surnames be adjacent

[jzonthemtn]

Add an optional parameter to the FirstName filter that requires a Surname immediately after.

Likewise, add an optional parameter to the Surname filter that requires a FirstName immediately preceding it.

Both options can be set independently, and both should default to false.

When either option is set to true, that filter should only report a span when it is preceded/followed by a span from the other filter.