More intuitive ban appeal process

[FeroxFoxxo]

Needs to be discussed further.

Premise: You should be able to easily file a ban appeal through the website of MASZ, that gets sent to the moderation team for direct approval. Perhaps through both the website, as a new column in the dashboard, or by using buttons on a appeal message.

• [ ] mail notification system
• [x] add field to guildconfig to allow appeal after x days
• [x] warning in guild dashboard if no appeals configured
• [x] show appeal stats and history in guild dashboard
• [x] add users from modcases and appeals to /member endpoint?

[FeroxFoxxo]

[zaanposni]

[zaanposni]

[zaanposni]

in release branch v2.7.0