BHoMObject python implementation

[Tom-Kingstone]

Description:

Implement a simple BHoMObject class in python with its own json serialiser that imitates the BHoM serialiser to ease transfer of data between c# and python (mostly to make development easier).

Aim for the class to be easily used as a base class with as little boilerplate as possible while retaining the ability to convert BHoM style json documents to BHoMObjects in both languages.