Support (X)HTML & XML for colored tags

[Chris2011]

Absolutely nice plugin. I added HTML but in general I know, that this was not implemented by default, but it works for interpolation braces as good as expected {{value}}.

But, I would really like to have this feature for HTML nested tags too, this will be very handy as you can see it here working: https://blog.jetbrains.com/idea/2011/04/new-in-105-highlighting-of-html-tag-tree/.

So I know for HTMl there must be more colors, and maybe it would be better to make a couple of colors hardcoded, as you already did it, but for more nested things like XML or HTML, we need steps of colors.

Here is a little demo: https://www.youtube.com/watch?v=kLNkYYH3mKk

Cheers

Chris