The engine needs to be refactored to support localization, and better practices.

[SahilTara]

• A resource file must be used for strings.

• ApiShell needs to be renamed to ApiGenShell

• All instances of Wait() should be removed and replaced with async await.

• IsValidPlatform and IsValidLanguage methods need to be moved from syncmodel to Platforms and ProgrammingLanguages.cs

• Controllers need to have cleaner return statements

• Remove header comments off of api after updating swagger docs.

[sibille]

Needs #136 to allow localize strings in GenerationData