`helix.dom/tags` removed

Hey! Seems like the style indent PR commented out helix.dom/tags. This caused my defc wrapper macro to break as I was relying on it.

Is this something that was intentional or are you open to re-adding it to help maintain API stability? Otherwise I could also just use ns-externs but ironically, the gen-tag macro still remains

@rschmukler I didn't think that anyone would rely on the helix.dom/tags var. What exactly are you using it for?

I'm tempted to clean up the gen-tag function and the rest of the code. You could use ns-externs, but you'll also have to filter out $d

I prefer hiccup to the macros so I am building a mappings of keywords to helix.dom macros in my own defc wrapper. Eg. :h1 resolves to helix.dom/h1 by the time the macro is done expanding.

I was doing that by iterating the tags, but using ns-externs works just as well.