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.