- Recipient::$postId: the commented post, set for comments
- ContactAttachmentPayload::$hash: hash of the VCF info
- ChatPatch: document the description field (up to 16000 chars,
empty string removes it)
- QuoteMarkup and MarkupType::Quote. createMarkupElement() threw
"Unknown or unsupported markup type" on a quote block, so a message
with a quote could not be parsed at all
New constructor parameters are optional and last, so existing
positional calls keep working; toArray() of these models now also
carries the new keys.