graphics/kcolorpicker: Update to 0.3.0
graphics/kimageannotator: Update to 0.7.0
Flavorize both ports for qt5 and qt6 variants and update consumers.
While here, drop several unused deps for graphics/gwenview.
Update graphics/kcolorpicker to latest upstream release
There's no release notes, but the 6 commits since the previous
release are mostly documentation and licensing changes. The library
is now LGPLv3+ licensed (previously the Makefile said GPLv2, which
applied to releases up to and including 0.1.1 of this software).