Mick Sayson 5f5f612841

feat(messages): History and offline message support for extended messages ...

* Added new negotiating friend state to allow delayed sending of offline
messages
* Added ability to flag currently outgoing message as broken in UI
* Reworked OfflineMsgEngine to support multiple receipt types
    * Moved resending logic out of the OfflineMsgEngine
    * Moved coordination of receipt and DispatchedMessageId into helper
    class usable for both ExtensionReceiptNum and ReceiptNum
    * Resending logic now has a failure case when the friend's extension
    set is lower than the required extensions needed for the message
    * When a user is known to be offline we do not allow use of any
    extensions
* Added DB support for broken message reasons
* Added DB support to tie an faux_offline_pending message to a required
extension set

2021-01-30 12:52:06 -08:00

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