Export files are now directly under the module folder,
e.g. `core/core.js`. With this, an import like `core/core`
won’t need a path mapping (e.g. via `System.paths`) any more.
This adds the `src` folder to all other import statements as well.
Currently, we create a separate injector for the passed-in / root bindings. This injectors sits below the one creating the application component. This means that the applicaiton component cannot access the passed-in bindings.
This used to be valid code:
```
class Foo {
constructor() {
this.bar = ‘string’;
}
}
```
This will now fail since ‘bar’ is not explicitly
defined as a field. We now have to write:
```
class Foo {
bar:string; // << REQUIRED
constructor() {
this.bar = ‘string’;
}
}
```
Entry-point to bootstrapping is a rootComponent. The bootstrapping
method, uses the component's selector to find the insertion element in
the DOM, and attaches the component in its ShadowRoot.
