Tooltips: proper tooltip service

Widgets/NButton.qml

@@ -139,18 +139,18 @@ Rectangle {
     onEntered: {
       root.hovered = true
       if (tooltipText) {
-        PanelService.tooltip.show(root, root.tooltipText)
+        TooltipService.show(root, root.tooltipText)
       }
     }
     onExited: {
       root.hovered = false
       if (tooltipText) {
-        PanelService.tooltip.hide()
+        TooltipService.hide()
       }
     }
     onPressed: mouse => {
                  if (tooltipText) {
-                   PanelService.tooltip.hide()
+                   TooltipService.hide()
                  }
                  if (mouse.button === Qt.LeftButton) {
                    root.clicked()
@@ -164,7 +164,7 @@ Rectangle {
     onCanceled: {
       root.hovered = false
       if (tooltipText) {
-        PanelService.tooltip.hide()
+        TooltipService.hide()
       }
     }
   }

Widgets/NIconButton.qml

@@ -73,20 +73,20 @@ Rectangle {
     onEntered: {
       hovering = root.enabled ? true : false
       if (tooltipText) {
-        PanelService.tooltip.show(parent, tooltipText, tooltipDirection)
+        TooltipService.show(parent, tooltipText, tooltipDirection)
       }
       root.entered()
     }
     onExited: {
       hovering = false
       if (tooltipText) {
-        PanelService.tooltip.hide()
+        TooltipService.hide()
       }
       root.exited()
     }
     onClicked: function (mouse) {
       if (tooltipText) {
-        PanelService.tooltip.hide()
+        TooltipService.hide()
       }
       if (!root.enabled && !allowClickWhenDisabled) {
         return