* fix logic error
* update types
* extract message content to variable
* use the new messageContent property
* sort out mention types to make them a map
* update getMentionAttributes to use AllowedMentionAttributes
* add plain text handling
* change type and handling for attributes when creating a mention in plain text
* tidy, add comment
* revert TS config change
* fix broken types in test
* update tests
* bump rte
* fix import and ts errors
* fix broken tests
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