fix(codegen): Adds string intern, encoded int, enum and legacy version support (#613)

- [X] Adds Enum migration rule
- [X] Adds legacy version (writing full int for version field)
- [X] Adds encoded int attribute
- [X] Adds intern string attribute
- [X] Fixes missing base deserialize/serialize

Projects/Server/Serialization/IGenericWriter.cs

@@ -116,7 +116,7 @@ namespace Server
         void Write(Map value) => Write((byte)(value?.MapIndex ?? 0xFF));
         void Write(Race value) => Write((byte)(value?.RaceIndex ?? 0xFF));
         void Write(ReadOnlySpan<byte> bytes);
-        unsafe void Write<T>(T value) where T : unmanaged, Enum
+        unsafe void WriteEnum<T>(T value) where T : unmanaged, Enum
         {
             var size = sizeof(T);
 
@@ -149,6 +149,7 @@ namespace Server
                     }
             }
         }
+
         long Seek(long offset, SeekOrigin origin);
     }
 }