Update Babylon Native and Babylon.js to the latest (#75)

- Updating Babylon Native to the latest to pull in the iOS XR improvements (less swimmy).
- Updating Babylon.js to the latest (4.2.0-beta.1) just to stay up to date and make sure we don't have any regressions.
- Updating the README.md to remove the old note about needing C++ tooling (now all (most) of the C++ is precompiled).
- Fixing a (potential?) bug in metro.config.js (I shared our solution with the community and someone found a bug in it that didn't repro for me, but their solution seems more correct according to docs and also works for us, so I changed it to be sure).

Author: ryantrem

Apps/PackageTest/package-lock.json

@@ -10,7 +10,7 @@
     "lint": "eslint . --ext .js,.jsx,.ts,.tsx"
   },
   "dependencies": {
-    "@babylonjs/core": "4.2.0-alpha.33",
+    "@babylonjs/core": "^4.2.0-beta.1",
     "@babylonjs/react-native": "file:../../Package/Assembled/babylonjs-react-native-0.0.1.tgz",
     "react": "16.13.1",
     "react-native": "0.63.1",

Apps/PackageTest/package.json

@@ -26,7 +26,7 @@ function getModuleMappings() {
         if (!path.isAbsolute(linkPath)) {
           linkPath = path.resolve(directory, linkPath);
         }
-        const linkStat = fs.lstatSync(linkPath);
+        const linkStat = fs.statSync(linkPath);
         if (linkStat.isDirectory()) {
           const packagePath = path.resolve(linkPath, "package.json");
           if (fs.existsSync(packagePath)) {

Apps/Playground/metro.config.js

@@ -10,8 +10,8 @@
     "lint": "eslint . --ext .js,.jsx,.ts,.tsx"
   },
   "dependencies": {
-    "@babylonjs/core": "4.2.0-alpha.33",
-    "@babylonjs/loaders": "4.2.0-alpha.33",
+    "@babylonjs/core": "^4.2.0-beta.1",
+    "@babylonjs/loaders": "^4.2.0-beta.1",
     "@babylonjs/react-native": "file:../../Modules/@babylonjs/react-native",
     "@react-native-community/slider": "^2.0.9",
     "logkitty": "^0.7.1",

Apps/Playground/package-lock.json

@@ -10,10 +10,6 @@ This package has several **peer dependencies**. If these dependencies are unmet,
 
 The `react-native-permissions` dependency is required for XR capabilities of Babylon.js (to request camera permissions automatically). Be sure to follow the `react-native-permissions` [instructions](https://github.com/react-native-community/react-native-permissions#setup) to update your `Podfile` and `Info.plist` (iOS) and/or `AndroidManifest.xml` (Android).
 
-### C++ Build Requirements
-
-This package includes C++ source, so platform specific tooling to build C++ code must be installed.
-
 ### Android Configuration
 
 The minimum Android SDK version is 18. This must be set as `minSdkVersion` in the consuming project's `build.gradle` file.