Adds rough first version of rating stars

It's not fully polished just yet

CURA-6013

plugins/Toolbox/resources/qml/RatingWidget.qml

@@ -0,0 +1,101 @@
+import QtQuick 2.2
+import QtQuick.Controls 2.0
+import UM 1.0 as UM
+
+Item
+{
+    id: ratingWidget
+
+    property real rating: 0
+    property int indexHovered: -1
+    property string packageId: ""
+    property int numRatings: 0
+    property int userRating: 0
+    width: contentRow.width
+    height: contentRow.height
+    MouseArea
+    {
+        id: mouseArea
+        anchors.fill: parent
+        hoverEnabled: ratingWidget.enabled
+        acceptedButtons: Qt.NoButton
+        onExited:
+        {
+            ratingWidget.indexHovered = -1
+        }
+
+        Row
+        {
+            id: contentRow
+            height: childrenRect.height
+            Repeater
+            {
+                model: 5 // We need to get 5 stars
+                Button
+                {
+                    id: control
+                    hoverEnabled: true
+                    onHoveredChanged:
+                    {
+                        if(hovered)
+                        {
+                            indexHovered = index
+                        }
+                    }
+
+                    property bool isStarFilled:
+                    {
+                        // If the entire widget is hovered, override the actual rating.
+                        if(ratingWidget.indexHovered >= 0)
+                        {
+                            return indexHovered >= index
+                        }
+
+                        if(ratingWidget.userRating > 0)
+                        {
+                            return userRating >= index +1
+                        }
+
+                        return rating >= index + 1
+                    }
+
+                    contentItem: Item {}
+                    height: UM.Theme.getSize("rating_star").height
+                    width: UM.Theme.getSize("rating_star").width
+                    background: UM.RecolorImage
+                    {
+                        source: UM.Theme.getIcon(control.isStarFilled ? "star_filled" : "star_empty")
+
+                        // Unfilled stars should always have the default color. Only filled stars should change on hover
+                        color:
+                        {
+                            if(!enabled)
+                            {
+                                return "#5a5a5a"
+                            }
+                            if((ratingWidget.indexHovered >= 0 || ratingWidget.userRating > 0) && isStarFilled)
+                            {
+                                return UM.Theme.getColor("primary")
+                            }
+                            return "#5a5a5a"
+                        }
+                    }
+                    onClicked:
+                    {
+                        if(userRating == 0)
+                        {
+                            //User didn't vote yet, locally fake it
+                            numRatings += 1
+                        }
+                        userRating = index + 1 // Fake local data
+                        toolbox.ratePackage(ratingWidget.packageId, index + 1)
+                    }
+                }
+            }
+            Label
+            {
+                text: "(" + numRatings + ")"
+            }
+        }
+    }
+}