Manually import newly created components in the right NgModules

[sis0k0]

Before we were delegating the task of declaring new components inside an NgModule to the external component schematic. However, this causes two problems:

• If a custom web extension is used for the web files (f.e. app.module.web.ts), the external schematic won't find an NgModule to declare the new component in. That's because the external schematic looks only for files ending with .module.ts.
• The component won't be declared inside the {N} module (app.module.tns.ts).

With these changes, the external component schematic is always called with skipImport: true and the new component is manually declared inside an appropriate NgModule (web, mobile or both).

The PR also adds a simple VSCode launch configuration for debugging unit tests.

fixes #78, #54