Player Quests v0.7

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• Beta release (v0.7 - Item Fetching Quests)

Changelog

• Add gather item action (#99)
• Add bare implementation of GatherItem + quest action dev docs
• Add quest auto-save on item list exit
• Add take item action (#102)
• add 'Quest Inventory' w/ restocking (#104)
• Fix overuse of mutable lists
• Fix current quest not starting (#108)