version 5.4.0

remove CORS default header from PIHTTPServer
fix several docs
fix PIMathVector::dot return type
add units directory with PIUnits facility

libs/http_server/microhttpd_server_p.cpp

@@ -363,5 +363,5 @@ void MicrohttpdServer::addFixedHeaders(MessageMutable & msg) {
 				msg.addHeader(Header::ContentType, "application/json; charset=utf-8");
 		}
 	}
-	msg.addHeader(Header::AccessControlAllowOrigin, "*");
+	// msg.addHeader(Header::AccessControlAllowOrigin, "*");
 }