[typescript-angular] generated package/ApiModule imports HttpModule but should import HttpClientModule instead

[JohannesHoppe]

Description

Latest templates for Angular 2+ use HttpClient instead of Http. Which is great. But the import is still referencing the wrong module, which makes the import useless:

swagger-codegen/modules/swagger-codegen/src/main/resources/typescript-angular/api.module.mustache

Line 13 in e4abddf

imports: [ CommonModule, HttpModule ],

// OLD
import { HttpModule } from '@angular/http'

@NgModule({
  imports:      [ CommonModule, HttpModule ],
}

should be:

// NEW
import { HttpClientModule } from '@angular/common/http';

@NgModule({
  imports:      [ CommonModule, HttpClientModule ],
}

[JohannesHoppe]

Dirty PR submitted.