Till now `nativescript-dev-webpack` plugin requires automatically all (root|page)(.css|.xml|.js|.ts) files from the unit-test-runner. However, this behavior was changed and now `nativescript-dev-webpack` plugin requires automatically all files except the files from App_Resources and .d.ts files. This led to the problem that `preuninstall.js` and `postinstall.js` scripts are automatically required. These scripts require `nativescript-hook`. On the other side `nativescript-hook` has a dynamic require here https://github.com/NativeScript/nativescript-hook/blob/master/index.js#L56. As this dynamic require is not compatible with webpack's concept for dynamic requires, the following warning is shown:
```
WARNING in ../node_modules/nativescript-hook/index.js 56:27-51
Critical dependency: the request of a dependency is an expression
 @ ../node_modules/nativescript-unit-test-runner/postinstall.js
 @ ../node_modules/nativescript-unit-test-runner sync (?<!App_Resources.*).(xml|css|js|(?<!d.)ts|scss)$
 @ ./app.js
```

This PR moves all the app's related code to the app folder. This way `nativescript-dev-webpack` will require automatically all files from app folder and the unneeded files (as postinstall and preuninstall) will not be required.

…rsion of runner is not compatible with old CLI