Update Babylon Native and Babylon.js to latest (#58)

- Updating Babylon Native to get the BGFX fix for re-instantiating the EngineView on iOS (as described in #15) (and verified this is fixed).
- Updating Babylon.js to get the 32-bit index buffer fix (as described in BabylonJS/BabylonNative#321) (did not verify this fix, but I think @RonnieAshlock did).

Author: ryantrem

Apps/Playground/package-lock.json

@@ -10,7 +10,7 @@
     "lint": "eslint . --ext .js,.jsx,.ts,.tsx"
   },
   "dependencies": {
-    "@babylonjs/core": "4.2.0-alpha.21",
+    "@babylonjs/core": "4.2.0-alpha.26",
     "@babylonjs/react-native": "file:../../Modules/@babylonjs/react-native",
     "@react-native-community/slider": "^2.0.9",
     "logkitty": "^0.7.1",

Apps/Playground/package.json

@@ -24,7 +24,7 @@
   "licenseFilename": "LICENSE",
   "readmeFilename": "README.md",
   "peerDependencies": {
-    "@babylonjs/core": "^4.2.0-alpha.21",
+    "@babylonjs/core": "^4.2.0-alpha.26",
     "react": "^16.8.1",
     "react-native": ">=0.60.0-rc.0 <1.0.x",
     "react-native-permissions": "^2.1.4"