Account emails

[tnix100]

Adds the ability for accounts to have an email address for password recovery and important alerts.

May also be used in the future for anti-spam mechanisms, such as detecting ban evasion and requiring email verification for suspicious accounts. But those are out of scope of this PR.

• HTML email templates
• Text email templates
• The ability for emails to be rendered and sent
• Create new token system (our current one sucks and won't work for email actions)
• The ability for email addresses to be added to accounts
• The ability for email addresses to be verified
• The ability for account passwords to be reset using an account's verified email address
• The ability for account security actions to be reverted and for the account to be locked when a suspicious change happens
• Send password change email alerts
• Send multi-factor authenticator adding/removing email alerts

Some of these will require frontend changes in meower-media/website. Email-related pages will be stored under emails in the website repo.

[HAZARD6896]

yippee

[tnix100]

I need to add the ability for email addresses to be removed before this gets merged.