Typescript Angular 2: Make service suffix configurable

Created by: tomvangreen

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Description of the PR

In earlier versions of the typescript-angular (2) swagger-codegen / openapi-generator, the suffix of the generated api servies was Api. This has been changed to Service in order to conform to angular naming guidelines.

For our project it makes sense that we can chose a different prefix in order to avoid naming collisions. For this I introduced 2 configuration parameters. serviceSuffix and serviceFileSuffix.

Service suffix is used as a suffix in the generated class name. Service file suffix is used as suffix in the file name (before the .ts extensions).

Technical comitee typescript: @TiFu, @taxpon, @sebastianhaas, @kenisteward, @Vrolijkx, @macjohnny #234 (closed)