Handle all errors properly

[jcxldn]

First of all, errors are not handled at all in some routes such as userstats and profile settings, and when errors are handled, only a few errors (namely 401 and 400) return a response code and message instead of empty data.

To-Do

• [ ] Handle errors in all routes
  • Add to existing routes
  • [ ] UserStats
  • [ ] ProfileSettings
  • [ ] TitleStats
  • [ ] LegacySearch
• [ ] Return error messages when appropriate
• [ ] Return the correct response code instead of empty data
• [ ] If an unexpected response code is recieved, do not return 200 and a blank message.