Dashboard Customisation: Colour Scheme and Statistical Test

Colour Scheme
Support for custom colours in the Dashboards:

• primary_color
• secondary_color
• current_data_color
• reference_data_color
• color_sequence
• fill_color
• zero_line_color
• non_visible_color
• underestimation_color
• overestimation_color
• majority_color

Statistical Test:
Support for user implemented statistical tests
Support for custom statistical tests in Dashboards and Profiles
Available tests:

• 'ks'
• 'z'
• 'chisquare'
• 'jensenshannon'
• 'kl_div'
• 'psi'
• 'wasserstein'
  more info: docs

Fixes:
#193