Rename package to 'flipper'

Summary:
- rename package `'sonar'` > `'flipper'`
- rename package `'sonar-static'` > `'flipper-static'`
- rename package export from `window.Sonar` to `window.Flipper`

Reviewed By: passy

Differential Revision: D9851181

fbshipit-source-id: 34d4447c3b287496b3d20ddb54471ce777ec74e1

src/chrome/DevicesList.js

@@ -14,7 +14,7 @@ import {
   Popover,
   styled,
   colors,
-} from 'sonar';
+} from 'flipper';
 
 const Heading = styled(Text)({
   display: 'block',