iOS support for "Recognize email guests"

[nickvergessen]

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• Follow up to recognice people invited by mail when they join the conversation spreed#6098

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🍏 iOS

• Show email icon when no name is set
• Show ? when "default Guest" name is used (?)
  Asked in Frontend for "Recognize email guests" spreed#13606 (comment)
• Show first letter on gray background like for normal guests when a name is set
• Check mentions (note their guest ID is longer than the old guests actor id and therefore potentially the regex needs adjusting)
  Fixed in Email fixes #1850
• Check autocomplete
  Works fine, but shows always email avatar (see third task)
• Check call view
  Works fine, but shows always email avatar (see third task)