[update] Update to Calligra Qt5 branch HEAD, including fix for hanging on SailfishOS
Squashed 'calligra/' changes from 36bc721..6a441fc

6a441fc Workaround a size issue in KoXmlReader.cpp that causes strange crashes
fd555e0 components: Update Viewer.qml to display thumbnails for content
3e37877 components: Implement separate backends for ContentsModel
9fc9825 components: Implement currentIndex support in TextDocumentImpl
6ed2b2f components: Implement setScrollBarValues in ComponentsKoCanvasController
31c7c97 components: Handle document offset changes and delayed loading properly in ViewController
84c2619 components: Fix status change signal to trigger later and enum types
e845b68 components: Rename PixmapItem to ImageDataItem
73d6190 Move KoListStyle metatype declaration to KoListStyle
2aa26aa Use const & for parameters of KoCanvasController::setDocumentOffset
87a0bd3 components: Remove the test documents since the viewer doesn't use hardcoded files.
790600d components: Remove ThumbnailModel since it duplicates ContentsModel's function

git-subtree-dir: calligra
git-subtree-split: 6a441fc459327800055a967a10dbf5cd7c561402
Merge commit 'c5cb9aa7d7a63b6aa838c84f10ab93be335eaab9'