* allow a user (admin or non-admin) to flag their own message
Initially implemented in https://github.com/HabitRPG/habitica/issues/8005
Use case for a non-admin needing to flag their own message:
- a new user posts a question
- a socialite answers
- the user posts again and reveals that they're under 13
- the socialite flags all of the user's messages and all replies to the user including the socialite's own reply (it's a requirement that all messages to and from under-aged users be hidden and some socialites know this)
* change NPC message for Tavern: "Rest in the Inn" > "Pause Damage"
* prevent a chat message being hidden until it's been flagged more than once
* allow non-Tavern (non-"Public") challenges to have zero gem prize
Also changes message about gem prize to say "Public Challenges" instead of "Tavern Challenges"
* finish committing merge conflict
Alys
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