[3/3] update openapi spec: update code interacting with generated code

Adjusted C++ code to handle with new and renamed objects, as well as
properties with different types.

As a result of changing types, the QML side had to be updated as well.
I hope I found everything by manually testing.

Additionally, the Qt Quick application has been updated to test the
remote sessions more easily and to make it launch again.

sailfish/qml/cover/CollectionPage.qml

@@ -41,7 +41,7 @@ CoverBackground {
             apiClient: appWindow.apiClient
             limit: cover.rowCount * 2 - 2
             imageTypes: [J.ImageType.Primary]
-            sortBy: "IsFavoriteOrLiked,Random"
+            sortBy: [J.SortBy.IsFavoriteOrLiked, J.SortBy.Random]
             recursive: true
             parentId: itemId
             autoReload:  false

sailfish/qml/cover/PosterCover.qml

@@ -38,7 +38,7 @@ CoverBackground {
     Shim {
         // Movies usually show their name on the poster,
         // so showing it here as well is a bit double
-        visible: mData.type !== "Movie"
+        visible: mData.type !== J.ItemType.Movie
         anchors {
             left: parent.left
             right: parent.right