[Feature] Minify output

It would be very helpful if the razor compiler would produce minified output.

The simplest approach would be to
- remove whitespace between elements (e.g. convert double spaces to single space, trim trailing/leading spaces)
- remove whitespace within attributes (e.g. `class=" foo bar "`)

A full-featured minifier can do much more than that - but I propose that the basics above would be good enough.