Plugin React Componenets (UI)

Summary:
# Zero Redux DevTools

Our awesome new Zero Rating SDK is based on a Redux/Saga Library, and part of the reason for it is the amazing DevTools we can add around it.
State & Sagas visibility, manipulation, and even time-machine.
Comes as a Flipper Plugin to Android first, then iOS.

Inspired by JavaScript's [Redux DevTools @ GitHub](https://github.com/reduxjs/redux-devtools).

## This Diff

**Adding UI to our Flipper Desktop App.**
- React components to structure our plugin. Root + Tabs.
  - Currently enabled: Actions Tab. with Actions (& state) Details side view
  - Currently Disabled: SDK Tab, Sagas Tab.
  - added a get "PluginFeatures" command to enable/disable desktop feature based on the app implementation  (Fb4a/ FBLite / Wild, etc)

{F232877109}

Reviewed By: egergo

Differential Revision: D20350029

fbshipit-source-id: 000a7fda70026fbc3e121e46a6ac5905af9c807d

desktop/static/icons.json

@@ -186,6 +186,7 @@
   ],
   "question-circle": [
     12,
+    16,
     20
   ],
   "question": [
@@ -236,6 +237,7 @@
   ],
   "tools": [
     12,
+    16,
     20
   ],
   "translate": [
@@ -384,5 +386,17 @@
   ],
   "sankey-diagram": [
     12
+  ],
+  "media-stack": [
+    16
+  ],
+  "question-hexagon": [
+    16
+  ],
+  "briefcase": [
+    16
+  ],
+  "business-briefcase": [
+    16
   ]
 }