Fixing previously bypasses `mypy` errors

[edan-bainglass]

I have resolved two of three mypy error bypasses:

1. CyclingParameter.value and CyclingParameter.default_value are now accurately Optional - required redesign of type checking in technique_widget.py
2. Redundant extra parameter definition in cycling.py models have been removed. Definitions are already present in nested Config classes

The last mypy bypass in query.py requires a more intensive refactoring effort to do away with global variables. This will be addressed in the near future.