[FIX] web: transfer attributes to subnodes in list views

In many cases, we allow class and style attributes in the arch of a
view.  However, it did not work in a list view, and there is not really
a good reason for that (only cost is a few runtime checks).

So, with this commit, we allow those attributes in list views (and
x2manys obviously).

However, note that there is a subtle (maybe slightly confusing)
behavior: when a list renderer is in 'readonly' mode, it does not
actually instantiate any field widgets.  In that case, it optimizes the
rendering by putting only the formatted value inside a cell:

<td>some value</td>

So, in that case, the only valid target for the attributes is the td:

<td class="hello">some value</td>

But when we are in edit mode, we actually have a field widget inside a
td:

<td><input>some value</input></td>

And in that case, the natural home for the attributes is the field
widget.  This is quite important, because this is the way attributes are
done in the form view, and we do not want different behaviour.

<td><input class="hello">some value</input></td>

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