add WidgetUpdater interface to container, replace struct fields with metamap

cwidgets/main.go

@@ -2,19 +2,12 @@ package cwidgets
 
 import (
 	"github.com/bcicen/ctop/logging"
-	ui "github.com/gizak/termui"
+	"github.com/bcicen/ctop/metrics"
 )
 
 var log = logging.Init()
 
-type ContainerWidgets interface {
-	Buffer() ui.Buffer
-	Highlight()
-	UnHighlight()
-	SetY(int)
-	SetWidth(int)
-	SetStatus(string)
-	SetCPU(int)
-	SetNet(int64, int64)
-	SetMem(int64, int64, int)
+type WidgetUpdater interface {
+	SetMeta(string, string)
+	SetMetrics(metrics.Metrics)
 }