Add custom pint wrapper

[Saelyos]

• Handle "Sequence of Quantity" correctly (Fixes BUG: DimensionalityError when voltage of the source is Quantity #145, closes Fix handling of quantities in input sequences #146)
• Get rid of unused functionalities (strict is always False, no named values)
• Improve performances

[benoit9126]

Great! Please add a line in the changelog and maybe some documentation related to the possibility to give a quantity of array or an array of quantities (maybe with different units such as v=[Q_(400, "V"), Q_(0.4, "kV"), 400])

[alihamdan]

This looks very good, thank you.

I just think it is better if this module was private: _wrapper.py. In the future we might delete it if pint evolves to have these improvements built in and we don't want anyone depending on it.

I also left two comments about additional tiny performance improvements, feel free to include.