Add ability to escape characters in Rewrite* input strings using
	'\' (e.g., "\$" to keep it from having its special meaning), and
	NoEscape/NE flag to disable filtering the rewritten output through
	URI encoding.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@89040 13f79535-47bb-0310-9956-ffa450edef68