[update] Update to Calligra Qt5 HEAD
Squashed 'calligra/' changes from 1734633..c330308

c330308 components: Add a method to get a thumbnail at a certain size to ContentsModel
3099df2 components: Use the image size for ImageDataItem if size is not set.
REVERT: 1734633 Add missing enum entry (warnings--)

git-subtree-dir: calligra
git-subtree-split: c330308f3071cabb58a51fd9288d29855edc6b93
Merge commit '2de08c37775c9d7dd339936d8686a3ee825cd08e'