Support VSIX Templates

[petrsvihlik]

Motivation

Besides the dotnet new way of starting a new project, developers would welcome starting it in Visual Studio with File -> New -> Project -> Kentico Cloud Web Application.

Inspiration

• https://github.com/aspnet/Blazor/tree/master/tooling/Microsoft.VisualStudio.BlazorExtension
• https://github.com/Plac3hold3r/MvxScaffolding/tree/master/src/MvxScaffolding.Vsix
• https://github.com/picoe/Eto/tree/master/src/Addins/Eto.Addin.VisualStudio

All of the projects above support both dotnet new and VSIX.

Reference

• https://docs.microsoft.com/en-us/visualstudio/extensibility/getting-started-with-the-vsix-project-template?view=vs-2017

Other resources regarding the new templating engine:

Wiki: https://github.com/dotnet/templating/wiki/%22Runnable-Project%22-Templates
Existing templates: https://github.com/dotnet/templating/wiki/Available-templates-for-dotnet-new
http://dotnetthoughts.net/create-a-dot-net-new-project-template-in-dot-net-core/