Create an MVC view engine

[sebastienros]

@jtkech is already working on it.

Right now the goal is to parse and render dynamically, and then cache the parsed AST.

Ultimately we could compile the AST to C# like Razor is doing to get the most of the performance. This should be pretty simple as there are only a few statements to support in the AST.

[sebastienros]

Got it working on the mvc branch. Now it's missing layout and section support.

We can create a custom tag {% layout '_Layout' %} or {% extends "_layout" %} (from pug)

Then {% section 'name' %} {% endsection %} to inject some statements in the specific section of the layout.

We can also have a _ViewStart.liquid that would be injected in all views under it, and define the layout there.