Serialization of Models

[mondus]

Closes #1353.

PR to add serialization of model objects.

Initial limitations

• No serialization of compile time functions. I.e. RTC functions only.
• No idea what to do with host functions...

TODO List:

• Create initial serialization classes
• Method of serializing
• Serialization writer of model objects
• Serialization reader of model objects
• Serialization of Python function strings (as Python).
• Tests (scope to be defined)