Start introducing the extension-method elements so we're not
	bound to hard-coded names and a bitmask.  We still use the
	bitmask for known methods, but we also have an array for
	extension method named.  Wherever we used the M_* constants
	we need to use a routine that knows about the new structure instead.

	This is far from complete, but AFAIK this interim work doesn't
	break anything -- especially the compile.  The rest of the
	work will be added in segments; this is just a checkpoint.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86210 13f79535-47bb-0310-9956-ffa450edef68