Colored emoji support.

Also, this approach seems to have a memory leak while converting
QStringList to QVariant.

qml/component/EmojiButton.qml

@@ -0,0 +1,20 @@
+import QtQuick 2.9
+import QtQuick.Controls 2.2
+
+Text {
+    property string category
+
+    width: 36
+    height: 36
+
+    horizontalAlignment: Text.AlignHCenter
+    verticalAlignment: Text.AlignVCenter
+
+    font.pointSize: 20
+    font.family: "Noto Color Emoji"
+
+    MouseArea {
+        anchors.fill: parent
+        onClicked: emojiCategory = category
+    }
+}