[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/adm/style/install_error.html

@@ -5,4 +5,4 @@
 	<p>{MESSAGE_TEXT}</p>
 </div>
 
-<!-- INCLUDE install_footer.html -->
+<!-- INCLUDE install_footer.html -->