add missing externs to repo

externs/webextension_polyfill/declarativenetrequest/URLTransform.hx

@@ -0,0 +1,63 @@
+package webextension_polyfill.declarativenetrequest;
+
+/**
+	Describes the type of the Rule.action.redirect.transform property.
+**/
+typedef URLTransform = {
+	/**
+		The new scheme for the request.
+		Optional.
+	**/
+	@:optional
+	var scheme : URLTransformSchemeEnum;
+	/**
+		The new username for the request.
+		Optional.
+	**/
+	@:optional
+	var username : String;
+	/**
+		The new password for the request.
+		Optional.
+	**/
+	@:optional
+	var password : String;
+	/**
+		The new host name for the request.
+		Optional.
+	**/
+	@:optional
+	var host : String;
+	/**
+		The new port for the request. If empty, the existing port is cleared.
+		Optional.
+	**/
+	@:optional
+	var port : String;
+	/**
+		The new path for the request. If empty, the existing path is cleared.
+		Optional.
+	**/
+	@:optional
+	var path : String;
+	/**
+		The new query for the request. Should be either empty, in which case the existing query is cleared; or should begin with
+		'?'. Cannot be specified if 'queryTransform' is specified.
+		Optional.
+	**/
+	@:optional
+	var query : String;
+	/**
+		Add, remove or replace query key-value pairs. Cannot be specified if 'query' is specified.
+		Optional.
+	**/
+	@:optional
+	var queryTransform : URLTransformQueryTransformType;
+	/**
+		The new fragment for the request. Should be either empty, in which case the existing fragment is cleared; or should
+		begin with '#'.
+		Optional.
+	**/
+	@:optional
+	var fragment : String;
+};