Feature: Razor templates support

[lordfanger]

In https://marketplace.visualstudio.com/items?itemName=MadsKristensen.RainbowBraces&ssr=false#review-details I saw a lot of requests for razor/blazor/cshtml support so I decided to make it supported by default. But If you don't want it, I can make it opt-in untill some possible buggies are fixed.

I work in these files a lot at work. If there are any, I'll find them soon. :)

[madskristensen]

Awesome. Thank you so much!!