Cbx

JOSS Review changes

This release incorporates all changes that were made, within the [JOSS review](https://github.com/openjournals/joss-reviews/issues/6611).

Important changes

* The names of the plotting routines were changed to be consistent with Python naming conventions.
* Unit test, now check for correctness of optimizers.
* Minor Bug fixes.

The main updates in this release:

* allow multi-dimensional input spaces. Particles are stile of size ``(M,N,d)`` but ``d`` can be a tuple now.
* remodeled termination criteria. Allowing termination per run now.
* Noise models are not part of the CBX class anymore and can be specified as a callable.
* Exposed ``norm``, ``normal``, ``copy`` and ``compute_consensus`` function
* Added proper implementation of effective step size scheduler

The first release of CBXPy provides the basic functionality and structure of the packages.