Plottoolbox

Fix

- fixed vlines_ymin and vlines_ymax

Refactor

- move to toolbox_utils.tsutils and complete pyproject.toml

Fix

- **plotutils.py**: Fixed legend_names to actually renamed columns in the dataframe

Fix

- correctly intepret "colors = ['auto']"

Refactor

- removed __future__
- moved format and % string interpolation to f strings

Fix

- the *_cli shouldn't return a plot value

Feat

- fixed return plot object and cleaned up function signatures to match plot type

Refactor

- begin to finish converting tstoolbox plot to plottoolbox