Set up Flipper decapitated packages

Summary:
This diff introduces the packages necessary for Flipper decapitated.

* flipper-common: utilities & types shared between client, server, flipper-plugin
* flipper-server-core: all device & client management goes in here. Basically flipper's backend
* flipper-ui-core: all UI goes in here, as far as it doesn't depend on Electron
* desktop: the Electron app, will load server-core and ui-core, and glue them together, providing implementations for some electron specific stuff like dialgos
* flipper-server: A node process hosting flipper-server-core, that can be connected to over websockets. And probably can serve a browser version of the UI as well.
* flipper-ui-browser: thin wrapper around flipper-ui-core, providing some browser specific behavior / stubs.
* flipper-dump: (might remove later), but want to hack a quick and dirt flipper dump in here, as alternative way to test flipper-server-core.

This diff just creates the packages, but doesn't move any code, so it can be summarized as:

restoftheowl

Reviewed By: nikoant

Differential Revision: D30218646

fbshipit-source-id: 735598a1261a98e584f52504b5eba01ec0afa162

desktop/flipper-ui-core/README.md

@@ -0,0 +1,3 @@
+# flipper-ui-core (TBD)
+
+Flipper's UI, agnostic of Electron vs Browser.

desktop/flipper-ui-core/package.json

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+{
+  "name": "flipper-ui-core",
+  "private": true,
+  "version": "0.0.0",
+  "description": "Flipper's UI",
+  "repository": "facebook/flipper",
+  "main": "lib/index.js",
+  "flipperBundlerEntry": "src",
+  "types": "lib/index.d.ts",
+  "license": "MIT",
+  "bugs": "https://github.com/facebook/flipper/issues",
+  "dependencies": {},
+  "devDependencies": {},
+  "peerDependencies": {},
+  "scripts": {
+    "reset": "rimraf lib *.tsbuildinfo",
+    "build": "tsc -b",
+    "prepack": "yarn reset && yarn build"
+  },
+  "files": [
+    "lib/**/*"
+  ],
+  "homepage": "https://github.com/facebook/flipper",
+  "keywords": [
+    "Flipper"
+  ],
+  "author": "Facebook, Inc"
+}

desktop/flipper-ui-core/src/index.tsx

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+export function helloWorld() {
+  return true;
+}

desktop/flipper-ui-core/tsconfig.json

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+{
+  "extends": "../tsconfig.base.json",
+  "compilerOptions": {
+    "outDir": "lib",
+    "rootDir": "src"
+  },
+  "references": [
+    {
+      "path": "../flipper-common"
+    },
+    {
+      "path": "../flipper-plugin"
+    }
+  ]
+}