Escape breadcrumb label

[vseager]

Fixes #87

[wubinworks]

@vseager
This fix is not enough, there are 2 problems:

• If you use addslashes, Mickey's Store will become Mickey\'s Store.
  I suggest add this method to Block.

/**
     * Escape JSON string
     *
     * @param string $str
     * @return string
     */
    public function escapeJsonString(string $str): string
    {
        return mb_substr(json_encode(
            $str,
            JSON_UNESCAPED_SLASHES | JSON_PRESERVE_ZERO_FRACTION
        ), 1, -1);
    }

And then

"name": "<?= $block->escapeJsonString($block->escapeHtml($variable)) ?>"

• Other files also need to be fixed:
  jsonld.phtml#L10
  cms.phtml#L1
  cms.phtml#L3
  cms.phtml#L6
  contact.phtml name, address, etc.