Extend the request class with helpers for reading server vars (server())
and HTTP request headers (header()). Refactor the existing code base
to make use of these helpers, make $_SERVER a deactivated super global.
Also introduce an is_ajax() method, which checks the X-Requested-With
header for the value 'XMLHttpRequest', which is sent by JavaScript
libraries, such as jQuery.
PHPBB3-9716
All class names have been adjusted to use a phpbb_request prefix,
allowing them to be autoloaded.
Also introduces some improvements to autoloading in general.
PHPBB3-9716
