remove window dependency

Summary:
Fixes required to be able to run Flipper in node.js:
* Adds checks if the `window`-object exists before using it, to allow running in node.
* Imports from within Flipper should directly reference the file they are requiring instead of `import from 'flipper'`. This was done in most of the places. Fixed a few occurrences where this wasn't the case. This is to prevent cyclic dependencies in node.
* shared packages (React, ReactDOM and Flipper) were exposed on the `window` before, changed this to `global` as this works in browser and node.
* Adds some missing methods to our electron stubs (used for testing and headless Flipper)

Reviewed By: passy

Differential Revision: D13786577

fbshipit-source-id: 145d560f1446e7d0bdec2acd8dd54dae983d7b36

src/chrome/DetailSidebar.js

@@ -7,7 +7,7 @@
 
 import React from 'react';
 import ReactDOM from 'react-dom';
-import {Sidebar} from 'flipper';
+import Sidebar from '../ui/components/Sidebar';
 import {connect} from 'react-redux';
 import {toggleRightSidebarAvailable} from '../reducers/application.js';
 
@@ -15,7 +15,7 @@ type Props = {
   children: any,
   rightSidebarVisible: boolean,
   rightSidebarAvailable: boolean,
-  toggleRightSidebarAvailable: (visible: boolean) => void,
+  toggleRightSidebarAvailable: (visible?: boolean) => any,
   width?: number,
 };