refactor all container widgets into subpackage

cwidgets/expanded/cpu.go

@@ -0,0 +1,28 @@
+package expanded
+
+import (
+	ui "github.com/gizak/termui"
+)
+
+type ExpandedCpu struct {
+	*ui.LineChart
+	hist FloatHist
+}
+
+func NewExpandedCpu() *ExpandedCpu {
+	cpu := &ExpandedCpu{ui.NewLineChart(), NewFloatHist(60)}
+	cpu.BorderLabel = "CPU"
+	cpu.Height = 10
+	cpu.Width = 50
+	cpu.X = 0
+	cpu.Y = 4
+	cpu.Data = cpu.hist.data
+	cpu.DataLabels = cpu.hist.labels
+	cpu.AxesColor = ui.ColorDefault
+	cpu.LineColor = ui.ColorGreen
+	return cpu
+}
+
+func (w *ExpandedCpu) Update(val int) {
+	w.hist.Append(float64(val))
+}