Add lancelot test for Emoji text rendering / color glyphs

We test both native text rendering and distance field text rendering
(which should switch to native for the emoji glyphs automatically),
in various configurations of text color, opacity, and background
color.

Change-Id: I06178820943cd2a52cf338f7eb5c0fca881cb625
Reviewed-by: Konstantin Ritt <ritt.ks@gmail.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>

tests/manual/scenegraph_lancelot/data/text/text_emoji.qml

@@ -0,0 +1,45 @@
+import QtQuick 2.0
+
+Item {
+    width: 320
+    height: 480
+
+    Component {
+        id: component
+        Column {
+            property variant listModel: model
+            Repeater {
+                model: [Text.NativeRendering, Text.QtRendering]
+                Rectangle {
+                    width: text.implicitWidth
+                    height: text.implicitHeight
+                    color: listModel.backGroundColor ? listModel.backGroundColor : "white"
+
+                    Text {
+                        id: text
+                        font.pixelSize: 32
+                        renderType: modelData
+                        text: "e😃m😇o😍j😜i😸!"
+
+                        color: listModel.color ? listModel.color : "black"
+                        opacity: listModel.opacity ? listModel.opacity : 1.0
+                    }
+                }
+            }
+        }
+    }
+
+    Column {
+        anchors.centerIn: parent
+        Repeater {
+            model: ListModel {
+                ListElement { color: "black" }
+                ListElement { color: "blue" }
+                ListElement { color: "#990000ff" }
+                ListElement { opacity: 0.5 }
+                ListElement { backGroundColor: "green" }
+            }
+            delegate: component
+        }
+    }
+}