Wrap image progress bars in loaders, fix cpu usage

TODO.md

@@ -59,7 +59,6 @@
 - Messed up message delegates position
 - Pausing uploads doesn't work well, servers end up dropping the connection 
 - Quickly posting with another account leads to sync stop
-- CPU usage
 - `code` not colored in room subtitle
 - In the "Leave me" room, "join > Hi > left" aren't combined
 - Event delegates changing height don't scroll the list

src/qml/Base/HAvatar.qml

@@ -45,7 +45,7 @@ Rectangle {
     HMxcImage {
         id: avatarImage
         anchors.fill: parent
-        progressBar.visible: false
+        showProgressBar: false
         visible: Boolean(sourceOverride || mxc)
         z: 2
         sourceSize.width: parent.width

src/qml/Base/HImage.qml

@@ -14,7 +14,9 @@ Image {
     property bool broken: false
     property bool animate: true
     property bool animated: Utils.urlExtension(image.source) === "gif"
-    property alias progressBar: progressBar
+
+    property alias showProgressBar: progressBarLoader.active
+    property bool inderterminateProgressBar: false
 
 
     Component {
@@ -64,16 +66,20 @@ Image {
         sourceComponent: animate && animated ? animatedImageComponent : null
     }
 
-    HCircleProgressBar {
+    HLoader {
-        id: progressBar
+        id: progressBarLoader
         anchors.centerIn: parent
         width: Math.min(parent.width, parent.height) * 0.5
         height: width
-        visible: image.status === Image.Loading
+        active: image.status === Image.Loading
-        value: image.progress
-        text: Math.round(value * 100) + "%"
 
-        Behavior on value { HNumberAnimation { factor: 2 } }
+        sourceComponent: HCircleProgressBar {
+            id: progressBar
+            value: image.progress
+            text: Math.round(value * 100) + "%"
+
+            Behavior on value { HNumberAnimation { factor: 2 } }
+        }
     }
 
     HIcon {

src/qml/Base/HMxcImage.qml

@@ -2,7 +2,7 @@ import QtQuick 2.12
 
 HImage {
     id: image
-    progressBar.indeterminate: isMxc
+    inderterminateProgressBar: isMxc
     source: sourceOverride || (show ? cachedPath : "")
     onWidthChanged: Qt.callLater(update)
     onHeightChanged: Qt.callLater(update)