* Attempt to use party data from the store rather than always fetching it from the API
* Move init code to shown() to prevent unnecessary network requests
* Use store party data in getGroup action if possible to save an API call
* Use store data rather than API call for party in challengeModal; remove unnecessary code in guilds:getGroup action
* Create party:getParty action and employ it in Group and ChallengeModal
* Use store instead of action return for party data
* Change how party data is stored
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