convert to emotion

Summary:
My benchmarks have shown react-emotion to be faster than the current implementation of `styled`. For this reason, I am converting all styling to [emotion](https://emotion.sh).

Benchmark results:
{F136839093}

The syntax is very similar between the two libraries. The main difference is that emotion only allows a single function for the whole style attribute, whereas the old implementation had functions for every style-attirbute.

Before:
```
{
  color: props => props.color,
  fontSize: props => props.size,
}
```

After:
```
props => ({
  color: props.color,
  fontSize: props.size,
})
```

Reviewed By: jknoxville

Differential Revision: D9479893

fbshipit-source-id: 2c39e4618f7e52ceacb67bbec8ae26114025723f

src/ui/components/data-inspector/DataInspector.js

@@ -18,34 +18,29 @@ import {clipboard} from 'electron';
 
 const deepEqual = require('deep-equal');
 
-const BaseContainer = styled.view(
-  {
-    fontFamily: 'Menlo, monospace',
-    fontSize: 11,
-    lineHeight: '17px',
-    filter: props => (props.disabled ? 'grayscale(100%)' : ''),
-    margin: props => (props.depth === 0 ? '7.5px 0' : '0'),
-    paddingLeft: 10,
-    userSelect: 'text',
-  },
-  {
-    ignoreAttributes: ['depth', 'disabled'],
-  },
-);
+const BaseContainer = styled('div')(props => ({
+  fontFamily: 'Menlo, monospace',
+  fontSize: 11,
+  lineHeight: '17px',
+  filter: props.disabled ? 'grayscale(100%)' : '',
+  margin: props.depth === 0 ? '7.5px 0' : '0',
+  paddingLeft: 10,
+  userSelect: 'text',
+}));
 
-const RecursiveBaseWrapper = styled.text({
+const RecursiveBaseWrapper = styled('span')({
   color: colors.red,
 });
 
-const Wrapper = styled.text({
+const Wrapper = styled('span')({
   color: '#555',
 });
 
-const PropertyContainer = styled.text({
+const PropertyContainer = styled('span')({
   paddingTop: '2px',
 });
 
-const ExpandControl = styled.text({
+const ExpandControl = styled('span')({
   color: '#6e6e6e',
   fontSize: 10,
   marginLeft: -11,
@@ -53,7 +48,7 @@ const ExpandControl = styled.text({
   whiteSpace: 'pre',
 });
 
-export const InspectorName = styled.text({
+export const InspectorName = styled('span')({
   color: colors.grapeDark1,
 });
 
@@ -474,10 +469,10 @@ export default class DataInspector extends Component<DataInspectorProps> {
 
       const keys = getSortedKeys({...value, ...diffValue});
 
-      const Added = styled.view({
+      const Added = styled('div')({
         backgroundColor: colors.tealTint70,
       });
-      const Removed = styled.view({
+      const Removed = styled('div')({
         backgroundColor: colors.cherryTint70,
       });