Add erazorHtml templating engine that escapes HTML by default.
Add erazorHtml templating engine that escapes HTML by default.

If you don't specify your templating engines in your UfrontConfiguration,
this will now be the default before normal `erazor`.

If you want the unsafe one, specify it in your `UfrontConfiguration`.

In a future version I'll probably deprecate the unsafe one, or at least rename it to make it more obvious it is unsafe.

ufront/ufront-mvc,ufront/ufront-mvc,kevinresol/ufront-mvc,kevinresol/ufront-mvc