add svg related tags to html5 scrubber

[gabrielformica]

What

This PR adds support for svg and related tags (path, rect, circle, line, polyline, polygon, path, g) in the html5 scrubber.

How

• added scrub functions, but let me know if this should be change to Meta.allow_tags_with_these_attributes
• from the allowed attributes, there's an extra check for fill and stroke to make sure there's no reference url(...), javascript:

Security

From the list of attributes, it seems the only problematic ones might be fill and stroke due to url(...) being a potential value

Extra

Added body to the list of tags allowing style

Test

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195 tests, 0 failures