[FIX] mass_mailing: vertical alignments & multiline text

* vertical alignment: Keep ‘vertical-align: top’ as default, but
define ‘middle’ exceptions for header and footer snippets.

* ‘comparison_table’: multiline text.
Remove inline style for inner <p/> elements and define default padding
for parent <td/> instead. This will allow to create multiple line of
text keeping a coherent margin between each <td/>.
A css set of rules triggering any kind of elements allow to use
multiline text for any kind of tag (p, h1, etc..)

* Footer snippets padding, minor

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