Uadapy

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* Reorganization of imports
* Documentation of distribution class
* Hideable mean in violin plot
* Consistency of various plotting functions

* plotting functions return created figure and axis objects
* plotting functions have optional parameter :code:`showplot` resulting in display of the figure
* same parameter naming
* controllable width for box and violin plot
* dedicated plotting functions for 1D distributions plots e.g. :code:`generate_boxplot(...)`

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Features in first version:

* Uncertainty-aware Principle Component Analysis
* Uncertainty-aware Multi-dimensional Scaling
* Basic visualizations:

* N-dimensional distributions: scatterplot matrices, iso-lines of probability distribution
* 1D distributions: box plots, violin plots, dot plots