[MERGE] Support Claws as a mail client.

[Aaron Bentley]

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Aaron Bentley wrote:
> Aaron Bentley has voted tweak.
> Status is now: Conditionally approved
> Comment:
> Looks fine, and if it makes Claws more usable than xdg-email would, it's
> definitely worth having in the core.  xdg-email doesn't work properly
> with Thunderbird either.
> 
> I'll apply the µ patch and submit.

Oh, and I'll also update the help to mention the claws value.

Aaron
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