Markdown toggle in the compose window

Registered by luis.nando

Hi developers,

Is it possible to add Markdown support in the compose window? I will argue for such a modification, because all tools are available with Vala. All needed is a button for Markdown toggle that would (1) save present state in the compose window buffer, (2) take its information, (3) render the html from the written markdown and (4) paste the html back in the compose window. Your fellow developer, Felipe, has already created a [vapi](https://github.com/Philip-Scott/Notes-up/blob/master/vapi/discount.vapi) for a C-Markdown implementation, which solves problems 2 and 3. Problems 1 and 4 might be easy for a developer used to Gtk. The button would work as a toggle, clicking it a second time would return to the original state of the buffer.

The inspiration for this approach is [Markdown-here](markdown-here.com) and [Mailmate](https://www.youtube.com/watch?v=e_SlbQzL9lc). Note, however, that Mailmate has this extra preview window, which I consider unecessary.

Thanks,

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Drafter:
luis.nando
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