[ticket/9556] Drop php closing tags, add trailing newline

Closing tags converted using Oleg's script.
remove-php-end-tags.py -a .

Trailing newlines added using the following where $ext is file extension.
find . -type f -name "*.$ext" -print | xargs printf "e %s\nw\n" | ed -s;

Extensions: php, css, html, js, xml.

PHPBB3-9556

phpBB/common.php

@@ -237,5 +237,3 @@ foreach ($cache->obtain_hooks() as $hook)
 {
 	@include($phpbb_root_path . 'includes/hooks/' . $hook . '.' . $phpEx);
 }
-
-?>