htmlStream_ragel: allow . (dot) in attribute name
#50
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htmlStreamparser tripped at this attribute:The parser doesn't allow attribute names to start with nor include dots.
W3 specs says attribute names can include dots but can't start with dots, while the more permissive whatwg specs allow both plus a lot more characters than
[.:_-].https://html.spec.whatwg.org/multipage/syntax.html#syntax-attribute-name
https://www.w3.org/TR/REC-html40/types.html#h-6.2
We meet somewhere in the middle to allow dots anywhere in attribute name but doesn't allow characters other than letters, digits ([0-9]), hyphens ("-"), underscores ("_"), colons (":"), and periods (".").