Move webgl renderer into addon dir

addons/xterm-addon-webgl/src/Platform.ts

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) 2016 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+const isNode = (typeof navigator === 'undefined') ? true : false;
+const userAgent = (isNode) ? 'node' : navigator.userAgent;
+
+export const isFirefox = !!~userAgent.indexOf('Firefox');
+export const isSafari = /^((?!chrome|android).)*safari/i.test(userAgent);