Start to include theme functions in the FSESU_Theme class

Add filter for the page title
Moved fsesu_content_nav to content_navigation function within FSESU_Theme and changed the references to it in index.php & page.php
Moved fsesu_entry_meta to entry_meta function within FSESU_Theme and changed the references to it in content.php, content-video.php
Moved fsesu_breadcrumb to breadcrumb function within FSESU_Theme and changed the references to it in header.php (more work needs to be done to improve this function)
Removed the now unnecessary util.php file and all references to it

Also, in footer.php added a check for the footer menu before displaying

Fixes #13