Reworked image handling, added banner for profiles. Made functions to start on xivauth. Refactored some code.

LightlessSyncServer/LightlessSyncShared/Models/UserProfileData.cs

@@ -6,6 +6,7 @@ namespace LightlessSyncShared.Models;
 public class UserProfileData
 {
     public string Base64ProfileImage { get; set; }
+    public string Base64BannerImage { get; set; }
     public bool FlaggedForReport { get; set; }
     public bool IsNSFW { get; set; }
     public bool ProfileDisabled { get; set; }