fix(core): Removes implicit cast between Serial and uint (#728)

* Fixes spellbooks using serial ctor
* Fixes misc items where someone thought they had an amount and it didn't
* Fixes all `Food` types.

Projects/Server/Serialization/IGenericReader.cs

@@ -33,6 +33,7 @@ namespace Server
         byte ReadByte();
         sbyte ReadSByte();
         bool ReadBool();
+        Serial ReadSerial();
 
         DateTime ReadDateTime() => new(ReadLong(), DateTimeKind.Utc);
         TimeSpan ReadTimeSpan() => new(ReadLong());