Add MarshalOptions attributes to support Laravel Queue payload

[yanlyan]

• add LaravelQueue flag on MarshalOptions
• add StructName on MarshalOptions option to custom class name

[elliotchance]

• LaravelQueue is not relevant to this library.
• I'm not convinced that StructName is useful either.

[yanlyan]

Hello @elliotchance
I'm new to open-source things, but can I fork this repo and use my customized library to meet my requirements?

[elliotchance]

You could fork it and modify it, but that is highly not recommended because now you'l have a separate version that won't be easy to update with bug fixes.

Some other approaches (with the most recommened at the top):

1. Fix your input data so that you don't have to make changes. Either by decoding/encoding it through PHP or whatever.
2. Decode the data into something more flexible like a map, then build the struct yourself by pulling out attributes as needed.
3. Handle any augmentation before parsing it. You might do a string replace on the raw data, for example.