Support tags with dots in the name

[JoosepAlviste]

Currently, components with a dot in the name are not handled correctly by the parser. For example, this template is parsed incorrectly and produces an error:

<template>
  <Hello.World>Testing</Hello.World>
</template>

In the opening tag, .World is parsed as attribute -> attribute_name and the closing tag results in an ERROR:

The .World part could be a part of the tag_name, or it could also be a separate node type.