rename extra field in ViewController to State

Signed-off-by: Jakub Sokołowski <jakub@status.im>

keys.go

@@ -17,7 +17,7 @@ func (vc *ViewController) CursorUp(g *gocui.Gui, v *gocui.View) error {
 }
 
 func (vc *ViewController) CursorDown(g *gocui.Gui, v *gocui.View) error {
-	peers := vc.Data.(*PeersState).list
+	peers := vc.State.(*PeersState).list
 	_, cy := v.Cursor()
 	// Don't go beyond available list of peers
 	if cy+1 >= len(peers) {

main.go

@@ -38,7 +38,9 @@ func main() {
 		Current:     true,
 		SelFgColor:  gocui.ColorBlack,
 		SelBgColor:  gocui.ColorGreen,
-		Data:        peers,
+		// extra field for view state
+		State: peers,
+		// corner positions
 		TopLeft: func(mx, my int) (int, int) {
 			return 0, 0
 		},
@@ -56,6 +58,7 @@ func main() {
 		Name:        "info",
 		Title:       "Details",
 		Placeholder: "Loading details...",
+		// corner positions
 		TopLeft: func(mx, my int) (int, int) {
 			return 0, my/2 + 1
 		},

view.go

@@ -19,7 +19,7 @@ type ViewController struct {
 	SelFgColor  gocui.Attribute
 	Keybindings []Binding
 	Manager     ViewManager
-	Data        interface{}
+	State       interface{}
 }
 
 type ViewManager struct {