cubicweb-vcsfile #4294710 Fix primary view of files containing HTML code [validation pending]

The primary view tries to render the content of VersionnedFiles. For HTML files, the current behavior is to "render" its content directly inline. This cannot ever work correctly: body tag inside a body tag, CSS classes that may have nothing in common with CubicWeb's own CSS, etc.

The better option would be to call pygments on the content to get nice syntax highlighting.

done in1.17.0
load left0.000
closed by#76b552a8ee2d [views] Display text/xml/html content inside <pre> tags (closes #4294710)
patch[views] Display text/xml/html content inside <pre> tags (closes #4294710) [folded]