Add animation to the "Now" button in the hourly views

If "Now" button is clicked in the Week view when we are in the
current week already, there is now scrolling animation added to
show clearly that view's time is changed.

Closes-Issue: #138

src/contents/ui/HourlyView.qml

@@ -631,6 +631,12 @@ Kirigami.Page {
                         return h;
                     }
 
+                    NumberAnimation on QQC2.ScrollBar.vertical.position {
+                        id: scrollAnimation
+                        duration: Kirigami.Units.longDuration
+                        easing.type: Easing.InOutQuad
+                    }
+
                     function setToCurrentTime() {
                         if(currentTimeMarkerLoader.active) {
                             const viewHeight = (applicationWindow().height - applicationWindow().pageStack.globalToolBar.height - headerBottomSeparator.height - allDayHeader.height - headerTopSeparator.height - headingRow.height - Kirigami.Units.gridUnit);
@@ -640,7 +646,8 @@ Kirigami.Page {
                             yPos = Math.max(0.0, yPos);
                             yPos = vScrollBar.size ? Math.min(vScrollBar.size, yPos) : Math.min(1.0, yPos);
 
-                            vScrollBar.position = yPos;
+                            scrollAnimation.to = yPos;
+                            scrollAnimation.start();
                         }
                     }