func NewSparkline() *Sparkline {
	return &Sparkline{
		TitleStyle: ui.Theme.Sparkline.Title,
		LineColor:  ui.Theme.Sparkline.Line,
		Reverse:    false,
	}
}
NewSparkline returns a unrenderable single sparkline that needs to be added to a SparklineGroup
package utils
import (
	"image"
	ui "github.com/gizak/termui/v3"
)
type Sparkline struct {
	Data       []float64
	Title      string
	TitleStyle ui.Style
	LineColor  ui.Color
	MaxVal     float64
	MaxHeight  int  
	Reverse    bool
}
type SparklineGroup struct {
	*ui.Block
	Sparklines []*Sparkline
}