Design Patterns second try

[joha2]

• Object serialization: Memento
• OptimizableVariable: State
• OptimizableVariable in ClassWithOptimizableVariables: Proxy

[joha2]

I opened a stackexchange question for this:

https://stackoverflow.com/questions/52792221/python3-how-to-redesign-a-nested-class-hierarchy-for-better-serializing-and-or