Mustache library call replacements

[paperscissors]

Legacy mustache library replaced with composer autoloader version. Several calls on the site still use the old version and need to be changed over.

[paperscissors]

New mustache calls look like:

get template: $template = CASHSystem::setMustacheTemplate("system_email") render template:

$encoded_html = CASHSystem::renderMustache(
     $template, array(
          // array of values to be passed to the mustache template
          ...
          )
);

old ones sometimes look something like

        if (file_exists(CASH_PLATFORM_ROOT . '/lib/mustache/Mustache.php')) {
            include_once(CASH_PLATFORM_ROOT . '/lib/mustache/Mustache.php');
            $this->mustache = new Mustache;
        }

and then call the mustacher later. or not. telltale sign is the /lib/mustache/Mustache.php business.