change penalty expiration datetime to null for perm bans

add tempban max time
allow searching for GUID
stats returns ranking as well
fix for promotion/demotion text

SharedLibraryCore/Database/DatabaseContext.cs

@@ -98,6 +98,9 @@ namespace SharedLibraryCore.Database
                 .WithMany(p => p.AdministeredPenalties)
                 .HasForeignKey(c => c.PunisherId)
                 .OnDelete(DeleteBehavior.Restrict);
+
+                entity.Property(p => p.Expires)
+                    .IsRequired(false);
             });
 
             modelBuilder.Entity<EFAliasLink>(entity =>

SharedLibraryCore/Database/Models/EFPenalty.cs

@@ -27,7 +27,7 @@ namespace SharedLibraryCore.Database.Models
         [Required]
         public DateTime When { get; set; }
         [Required]
-        public DateTime Expires { get; set; }
+        public DateTime? Expires { get; set; }
         [Required]
         public string Offense { get; set; }
         public string AutomatedOffense { get; set; }