lib/rest: process HTML entities within XML

MEGAcmd currently includes escaped HTML4 entites in its XML messages.
This behavior deviates from the XML standard, but currently it prevents
rclone from being able to use the remote.

lib/rest/rest.go

@@ -167,6 +167,10 @@ func DecodeJSON(resp *http.Response, result interface{}) (err error) {
 func DecodeXML(resp *http.Response, result interface{}) (err error) {
 	defer fs.CheckClose(resp.Body, &err)
 	decoder := xml.NewDecoder(resp.Body)
+	// MEGAcmd has included escaped HTML entities in its XML output, so we have to be able to
+	// decode them.
+	decoder.Strict = false
+	decoder.Entity = xml.HTMLEntity
 	return decoder.Decode(result)
 }