ui: instant messaging ui update

- rounded corners, use Arial font, anti-aliasing, misc.
- style sync with instantmessagingwidget

Change-Id: I0b214550110dc45593a3e45094324ee6da6e740c
Tuleap: #148
diff --git a/callwidget.cpp b/callwidget.cpp
index fce5e6c..7bc345c 100644
--- a/callwidget.cpp
+++ b/callwidget.cpp
@@ -97,6 +97,11 @@
     ui->ringLogo->setPixmap(logo.scaledToHeight(100, Qt::SmoothTransformation));
     ui->ringLogo->setAlignment(Qt::AlignHCenter);
 
+    QPixmap sendPixmap(":/images/ic_send_white.svg");
+    QIcon sendIcon(sendPixmap);
+    ui->sendButton->setIcon(sendIcon);
+    ui->sendButton->setIconSize(sendPixmap.rect().size());
+
     GlobalInstances::setPixmapManipulator(std::unique_ptr<Interfaces::PixbufManipulator>(new Interfaces::PixbufManipulator()));
 
     try {