Update HtmlAttributes.json

Added new attributes:
autocapitalize
autocorrect
onsearch
inputmode
itemprop, itemscope, itemtype (Microdata - Schema.org)
srcset (Responsive images)

Added new attribute options:
autocomplete ("billing", "cc-name", "cc-number", "cc-css", "cc-exp-month", "cc-exp-year", "cc-type", "country", "email", "name", "postal-code", "region", "shipping", "street-address", "tel", "url")
http-equiv ("content-language", "X-UA-Compatible")
meta/name ("format-detection", "robots", "viewport")
link/rel ("import")

Discussed at #8019