[update] Update to Calligra Qt5 branch HEAD
Squashed 'calligra/' changes from 6a441fc..148f4ac

148f4ac Don't crash when KSelectAction::menu() returns null
630093d Use a fixed DPI value in KoDPI if we don't have a QApplication
1690462 components: Fix licence headers to use LGPLv2+ instead of GPLv2+

git-subtree-dir: calligra
git-subtree-split: 148f4ac7da1d91ef5939e7725dfbc44cf4749863
Merge commit '4ec20c2b3fcb2da238439098a6ccd553d0765d3a'