Theme saturation

[NateBaldwinDesign]

Description

Fixes #138

• Add saturation parameter to Theme class
• Add setter to theme as theme.saturation = x
• Updated docs to include saturation parameter and setter
• Added test for saturation setting along with other setter functions
• Added theme setters to add colors, remove colors, and update color parameters

updateColor setter accepts an object with two key-value pairs. The first is the name of the color to be modified. The second is the property to update and the value you wish to update it to.

let color = new Color({
  name: 'Red',
  colorKeys: ['#ff0000', '#ff3200'],
  ratios: [3, 4, 5]
});
let theme = new Theme ({
 colors: [color]
 backgroundColor: '#f5f5f5'
});

theme.updateColor = {name: 'Red', ratios: [4.5, 7, 9]}

Motivation

• Add another dimension to color theme adaptability
• Enhance the customization process for Themes

Screenshots

To-do list

• [x] I have read the CONTRIBUTING document.
• [x] This pull request is ready to merge.