Convert AphrontTableView to safe HTML

Summary:
Lots of killed phutil_escape_html().

Done by searching for AphrontTableView and then $rows (usually) backwards.

Test Plan:
Looked at homepage.

echo id(new AphrontTableView(array(array('<'))))->render();

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4884