This PR adds a “progression mode” setting to quests¹, which can either be linear (the default), where tasks can progress only when the quest is unlocked as before, or flexible, where tasks can progress even while the quest is locked, but rewards can only be claimed once the quest is unlocked. If all tasks are completed but the quest is still locked, the quest is put in a special “provisionally completed” status.

This setting is useful for quests that, for instance, require defeating rare mobs, since the quest can be completed even if the player defeats that mob too soon.

To do:

• Add quest setting
• Add basic implementation
• Sync quest completion statuses on join (I might need help with this nvm found the issue)
• Make rewards of provisionally completed quests be displayed as locked in RewardListWidget
• Make sure that the provisional quest completion toast requires the quest in question to be visible (is this really needed?)