#661 /e not supported in php 7.0

[Lee Worden]

Trouble running this code in php 7.0 because

PHP Warning: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead

Fair enough. But code in WWInterface uses the /e flag to do "smart" regular expression replacements. So the code needs to be updated.

[Lee Worden]

[#97] is related (in that it'll become moot when this one is fixed)