Orleans templates for 2.0.0

With the release of the dotnet templating engine, which is the new way of creating new .Net projects and solutions from the command line and form various IDEs we decided to recreate the previously available templates in the VSIX based on the new engine.

With the Visual Studio 2017 15.3 release it is possible to use the same templates from the IDE too.

For dotnet.exe usage a NuGet package must be installed, for Visual Studio 2017 consumption a separate VSIX needs to be installed.

This work will be based on a previous PR by @galvesribeiro.

The new templating engine will enable the adding of logic to the templates, so more complex, interactive templates can be developed in the future.

To enable separate versioning, development and release from Orleans itself we'll have the new templates in a separate GitHub repository.

We looking forward for community suggested templates, please use this issue to give us ideas, what would be the greatest help in form of templates for you.

Resources for template authoring:

• Template Engine repository
• Template Engine samples
• Template Engine Wiki
• Sidewaffle Creator
• Sidewaffle Creator video