Bring in newest BabylonNative & Babylon.js (#136)

* Update BabylonNative to fix engine dispose after entering an XR session.  Still need the corresponding B.JS change.

* Update BabylonNative

* Update packagetest package-lock.json

* Update peer dependency for Babylon.js to 5.0.0-alpha.6

Author: Alex-MSFT

Apps/PackageTest/package-lock.json

@@ -10,7 +10,7 @@
     "lint": "eslint . --ext .js,.jsx,.ts,.tsx"
   },
   "dependencies": {
-    "@babylonjs/core": "^4.2.0",
+    "@babylonjs/core": "^5.0.0-alpha.6",
     "@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

@@ -10,8 +10,8 @@
     "lint": "eslint . --ext .js,.jsx,.ts,.tsx"
   },
   "dependencies": {
-    "@babylonjs/core": "^4.2.0",
-    "@babylonjs/loaders": "^4.2.0",
+    "@babylonjs/core": "^5.0.0-alpha.6",
+    "@babylonjs/loaders": "^5.0.0-alpha.6",
     "@babylonjs/react-native": "file:../../Modules/@babylonjs/react-native",
     "@react-native-community/slider": "^2.0.9",
     "logkitty": "^0.7.1",

Apps/Playground/package-lock.json

@@ -27,7 +27,7 @@
     "base-64": "^0.1.0"
   },
   "peerDependencies": {
-    "@babylonjs/core": "^4.2.0",
+    "@babylonjs/core": "^5.0.0-alpha.6",
     "react": "^16.13.1",
     "react-native": "^0.63.1",
     "react-native-permissions": "^2.1.4"