Prepare Image & Video loading for E2EE

Changes the urls to make sure they are decrypted, while making sure that
it is backwards compatible to libQuotient 0.6

imports/NeoChat/Component/FullScreenImage.qml

@@ -9,8 +9,8 @@ import org.kde.kirigami 2.15 as Kirigami
 ApplicationWindow {
     id: root
 
+    property alias source: image.source
     property string filename
-    property url localPath
     property string blurhash: ""
     property int imageWidth: -1
     property int imageHeight: -1
@@ -45,8 +45,6 @@ ApplicationWindow {
 
         fillMode: Image.PreserveAspectFit
 
-        source: localPath
-
         Image {
             anchors.centerIn: parent
             width: image.width

imports/NeoChat/Component/Timeline/ImageDelegate.qml

@@ -35,9 +35,9 @@ TimelineContainer {
     innerObject: Image {
         id: img
 
-
         Layout.maximumWidth: imageDelegate.bubbleMaxWidth
-        source: "image://mxc/" + mediaId
+        Layout.maximumHeight: imageDelegate.bubbleMaxWidth / imageDelegate.info.w * imageDelegate.info.h
+        source: model.mediaUrl
 
         Image {
             anchors.fill: parent
@@ -95,7 +95,7 @@ TimelineContainer {
             onTapped: {
                 fullScreenImage.createObject(parent, {
                     filename: eventId,
-                    localPath: currentRoom.urlToDownload(eventId),
+                    source: model.mediaUrl,
                     blurhash: model.content.info["xyz.amorgan.blurhash"],
                     imageWidth: content.info.w,
                     imageHeight: content.info.h

imports/NeoChat/Component/Timeline/VideoDelegate.qml

@@ -55,14 +55,6 @@ TimelineContainer {
 
         fillMode: VideoOutput.PreserveAspectFit
 
-        Component.onCompleted: {
-            if (downloaded) {
-                source = progressInfo.localPath
-            } else {
-                source = currentRoom.urlToMxcUrl(content.url)
-            }
-        }
-
         onDurationChanged: {
             if (!duration) {
                 vid.supportStreaming = false;

imports/NeoChat/Dialog/UserDetailDialog.qml

@@ -52,7 +52,7 @@ Kirigami.OverlaySheet {
 
                     onClicked: {
                         if (avatarMediaId) {
-                            fullScreenImage.createObject(parent, {"filename": displayName, "localPath": room.urlToMxcUrl(avatarUrl)}).showFullScreen()
+                            fullScreenImage.createObject(parent, {"filename": displayName, "source": room.urlToMxcUrl(avatarUrl)}).showFullScreen()
                         }
                     }
                 }