Improve layout of annotation configuration dialogs
Summary:
The config dialog of each annotation tool is now a form layout without group boxes. Everything is aligned.
Reviewers: Okular, VDG, ngraham, aacid
Reviewed By: Okular, VDG, ngraham, aacid
Subscribers: sander, davidhurka, aacid, okular-devel, knambiar, ngraham
Tags: Okular
Maniphest Tasks: T8076
Differential Revision: https://phabricator.kde.org/D10859