Implement reception of reactions

Ruben De Smetrequested to merge
reactions into master

Receiving part of #99

TODO:

  • Receiving a reaction should go into the reaction table (tested with sync and with normal messages)
  • Implement message reloading when a reaction is received
  • Add Vec<Reaction> to AugmentedMessage
  • Implement UI component for viewing reactions
  • Migrate R@number:🥔-style messages into reactions table
Edited by Ruben De Smet

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