WebsiteV3: added privacy.php; added bootstrap icons; updated several page layouts;

git-svn-id: http://svn.code.sf.net/p/processhacker/code/misc@5538 21ef857c-d57f-4fe0-8362-d861dc6d29cd
WebsiteV3: fixed Bootstrap CDN support; updated downloads.php

git-svn-id: http://svn.code.sf.net/p/processhacker/code/misc@5540 21ef857c-d57f-4fe0-8362-d861dc6d29cd