Support avatars for contacts from iCloud's CardDAV

[balupton]

When using Thunderbird with iCloud's `contacts.icloud.com` CardDAV server, any avatars that were made via Apple's ecosystem, do not have their avatars rendered correctly. Perhaps iCloud is using an image format, like HEIC that Thunderbird does not support.

I have noticed however, that Evolution Mail does support such contact avatars.

[Jon]

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