fix(Chat): supports very large image, use clip if necessary

tests/ui/modules/Linphone/Chat/Chat.qml

@@ -167,7 +167,7 @@ ColumnLayout {
       ListElement { $dateSection: 1465389121000; $timestamp: 1465389133000; $type: 'event'; $content: 'incoming_call' }
       ListElement { $dateSection: 1465389121000; $timestamp: 1465389439000; $type: 'message'; $content: 'www.test.fr<blink>Perfect!</blink> bg  g vg gv v g v hgv gv gv   jhb jh b  jb jh hg vg    cfcy f  v u  uyg   f tf tf  ft f tf t  t  fy ft f tu  ty f  rd rd  d d   uu gu y  gg y f  r dr   ' }
       ListElement { $dateSection: 1465389121000; $timestamp: 1465389500000; $type: 'event'; $content: 'end_call' }
-      ListElement { $dateSection: 1465994221000; $outgoing: true; $timestamp: 1465924321000; $type: 'message'; $content: 'https://cdn.pixabay.com/photo/2014/03/29/09/17/cat-300572_960_720.jpg You\'ve heard the expression, "Just believe it and http://writm.com/wp-content/uploads/2016/08/Cat-hd-wallpapers.jpg it will https://cdn.pixabay.com/photo/2014/03/29/09/17/cat-300572_960_720.jpg come." http://html.com/wp-content/uploads/html-com-1.png Well, technically, that is true, https://cdn.pixabay.com/photo/2014/03/29/09/17/cat-300572_960_720.jpg however, \'believing\' is not just thinking that you can have it...' }
+      ListElement { $dateSection: 1465994221000; $outgoing: true; $timestamp: 1465924321000; $type: 'message'; $content: 'http://mithril94.free.fr/sigbarfactory/fonts/show/tribal.gif https://cdn.pixabay.com/photo/2014/03/29/09/17/cat-300572_960_720.jpg You\'ve heard the expression, "Just believe it and http://writm.com/wp-content/uploads/2016/08/Cat-hd-wallpapers.jpg it will https://cdn.pixabay.com/photo/2014/03/29/09/17/cat-300572_960_720.jpg come." http://html.com/wp-content/uploads/html-com-1.png Well, technically, that is true, https://cdn.pixabay.com/photo/2014/03/29/09/17/cat-300572_960_720.jpg however, \'believing\' is not just thinking that you can have it...' }
       ListElement { $dateSection: 1465994221000; $timestamp: 1465924391000; $type: 'event'; $content: 'lost_incoming_call' }
     }
   }

tests/ui/modules/Linphone/Chat/Message.qml

@@ -36,12 +36,13 @@ Item {
       left: container.left
       right: container.right
     }
+    clip: true
     padding: ChatStyle.entry.message.padding
     readOnly: true
     selectByMouse: true
     text: Utils.encodeUrisToQmlFormat($content, {
-      imagesHeight: ChatStyle.entry.message.imagesHeight,
-      imagesWidth: 'auto'
+      imagesHeight: ChatStyle.entry.message.images.height,
+      imagesWidth: ChatStyle.entry.message.images.width
     })
     wrapMode: Text.Wrap
 

tests/ui/modules/Linphone/Styles/ChatStyle.qml

@@ -47,7 +47,6 @@ QtObject {
     }
 
     property QtObject message: QtObject {
-      property int imagesHeight: 48
       property int padding: 8
       property int radius: 4
 
@@ -57,6 +56,11 @@ QtObject {
         property int rightMargin: 5
       }
 
+      property QtObject images: QtObject {
+        property int height: 48
+        // `width` can be used.
+      }
+
       property QtObject incoming: QtObject {
         property color backgroundColor: Colors.y
         property int avatarSize: 20