hexToRgb()
Overview
public string function hexToRgb(
      required string  hexColour
    ,          boolean validated = false
)
Converts a hex colour value to RGB.
Throws SimpleColourPicker.invalidHexColour error if the input value is not a valid hex colour.
Arguments
| Name | Type | Required | Description | 
|---|---|---|---|
| hexColour | string | Yes | The hex colour value to be converted | 
| validated | boolean | No (default=false) | Has the value already been validated as a hex colour? If so, skip validating it again |