Use `defaultCollection` and extend schematics

[imhoffd]

Can use a default collection with ng g:

https://github.com/angular/angular-cli/blob/master/docs/documentation/angular-workspace.md

Extend all Angular schematics in ng-toolkit (don't forget about aliases): https://github.com/angular/devkit/blob/master/packages/angular_devkit/schematics/collection-schema.json#L37-L40

[imhoffd]

📝 When this is implemented, I think there'd be no reason for ionic generate for angular projects. We could probably remove it in favor of recommending/documenting npx ng g

[imhoffd]

In RC.8