Add InviteOffer component

harmonyqml/components/base/HButton.qml

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+import QtQuick 2.7
+import QtQuick.Controls 2.2
+import QtQuick.Layouts 1.4
+
+Button {
+    property string iconName: ""
+
+    id: button
+    display: Button.TextBesideIcon
+    icon.source: "../../icons/" + iconName + ".svg"
+}

harmonyqml/components/base/HRowLayout.qml

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+import QtQuick 2.7
+import QtQuick.Controls 2.2
+import QtQuick.Layouts 1.4
+
+RowLayout {
+    id: rowLayout
+    spacing: 0
+
+    property int totalSpacing:
+        spacing * Math.max(0, (rowLayout.visibleChildren.length - 1))
+}