Secondary rewrite

[HyperCodec]

This is a tracking issue for the secondary rewrite of this crate (still pre-1.0.0).

Mutation

• weights mutation
• activation mutation
• split connection
• add connection
• remove connection
• bias mutation
• general mutate function

Crossover

• general crossover function (TODO figure out subtasks)

Prediction

• write test cases
• optimize (if needed)

Activation

• Use TypeID for custom activation functions #82
• Implement softmax #81

API

• Detach MutationSettings from specific NeuralNetwork instances. #92
• move activation registry to simulation-level context