User table column cleanup 🧹

[tadhgboyle]

Cleanup:

• delete reputation
• delete warning_points
• delete avatar_updated (we can pass the current epoch in the one place we use it)
• delete tfa_type (we planned to add email tfa support, but this is strongly regarded as a terrible tfa method)
• rename lastip to last_ip
• rename is_banned to banned
• rename theme_id to template_id
• rename night_mode to dark_mode
• rename pass_method to password_method

Bonus:

• create nl2_users_meta key/value table so modules can attach specific information to users without cluttering the nl2_users table more, or creating their own table for the purpose
  • reputation and topic_updates could be moved here (to make the table not include column from Forum module)
  • instead of setting password_method to 'enjin-import' to determine if a user has been imported from Enjin, we could attach some meta like enjin-imported to true
• (maybe) create nl2_users_tfa to cleanup the nl2_users table more, since tfa accounts for 4 columns