[part 4] Feat/port admin datasource

[mrjvs]

Changes:

• added endpoints to list/create/view/edit communities (for admins pages), also implemented into frontend
• added endpoints to manage reports (list/ignore/removePost), also implemented into frontend
  • Breaking change: now only lists 150 reports maximum
• moved post deletion audit logs to miiverse-api
• added endpoints to list users (for admin pages), also implemented into frontend
• added endpoints to view user profiles, also implemented into frontend
  • Breaking changes: follower counts now report correctly
  • Breaking change: deleted/banned users now show up as 404
• added endpoints to view user profiles, view moderation profiles and update moderation profiles (for admin pages), also implemented into frontend
  • Breaking change: moderators can now view the account status, as a replacement for banned users showing up differently.
• Added endpoints for notifications, also implemented into frontend
• Deleted unused database methods

Todos:

• Create better 404 page for user profile pages that include moderation info
• Test notification changes
• Test moderation profile updates

Notes:

• Depends on [part 3] Port follower and current user datasource to miiverse-api #481 - dont merge until that PR is merged

Resolves a part of #112