Force the width of the elements based on the preview width, but not for
messages that were formatted with text-highlight module (there is one
exception and it is the plain text formatting).
Also include additional fixes to our CSS:
* don't break the text in the middle of contact
* add missing border around some iframes
* remove some of the margins and paddings
Avoid redrawing (thus loosing the selection and scroll position) of
preview window on style change by defining the colors through CSS styles.
On style change we just update the CSS color definitions and preview will
update itself without redraw.
We used to do this before WebKit and it looked better.
Also fix up the header section for right-to-left locales:
put the collapse button on the right, and images on the left.
All mail-parsing and formatting code has been moved to em-format.
Parsing is handeled by EMailParser class, formatting by EMailFormatter.
Both classes have registry which hold extensions - simple classes
that do actual parsing and formatting. Each supported mime-type
has it's own parser and formatter extension class.
