Add the ability to extend the methods that Apache understands

Add the ability to extend the methods that Apache understands
and have those methods <limit>able in the httpd.conf. It uses
the same bit mask/shifted offset as the original HTTP methods
such as M_GET or M_POST, but expands the total bits from an int to
an ap_int64_t to handle more bits for new request methods than
an int provides.
Submitted by:	Cody Sherr <csherr@covalent.net>

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@89869 13f79535-47bb-0310-9956-ffa450edef68