Remove ImageItem, Paintable and use unified image provider.

res.qrc

@@ -3,7 +3,6 @@
         <file>qtquickcontrols2.conf</file>
         <file>qml/main.qml</file>
         <file>js/md.js</file>
-        <file>js/util.js</file>
         <file>imports/Spectral/Component/Emoji/EmojiPicker.qml</file>
         <file>imports/Spectral/Component/Emoji/qmldir</file>
         <file>imports/Spectral/Component/Timeline/DownloadableContent.qml</file>
@@ -47,5 +46,6 @@
         <file>imports/Spectral/Effect/CircleMask.qml</file>
         <file>assets/img/roompanel-dark.svg</file>
         <file>imports/Spectral/Component/Timeline/ImageDelegate.qml</file>
+        <file>imports/Spectral/Component/Avatar.qml</file>
     </qresource>
 </RCC>