fix: Adds generic entity persistence support and BOBEntry as entities (#1527)

### Summary
Adds a generic entity persistence. This can be used to create new entity types that have a `Serial`.

Here is an example:

```cs
public class BOBEntries : GenericEntitySerialization<IBOBEntry>
{
    public static void Configure()
    {
        Configure("BOBEntries");
    }
}
```

The annotation tells the system what folder to serialize the entries to. The class/interface (`IBOBEntry`) is the root type that implements `ISerializable`.

Projects/Server/Serialization/ISerializable.cs

@@ -24,8 +24,6 @@ public interface ISerializable
     // Should be serialized/deserialized with the index so it can be referenced by IGenericReader
     DateTime Created { get; set; }
 
-    // Should be serialized/deserialized with the index so it can be referenced by IGenericReader
-    DateTime LastSerialized { get; protected internal set; }
     long SavePosition { get; protected internal set; }
     BufferWriter SaveBuffer { get; protected internal set; }
 
@@ -61,7 +59,6 @@ public interface ISerializable
             return;
         }
 
-        LastSerialized = Core.Now;
         SaveBuffer.Seek(0, SeekOrigin.Begin);
         Serialize(SaveBuffer);