Add AnnotWidget::setFormAdditionalAction

And the corresponding Form helper

refactor the code that gets the char * from
Annot::FormAdditionalActionsType to a function
6 jobs for setFormAdditionalAction in 7 minutes and 56 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #374958
build

00:07:54

passed #374963
build_android

00:01:01

passed #374959
build_clang_libcpp

00:07:49

passed #374962
build_clazy

00:03:05

passed #374961
build_mingw64_fedora

00:02:55

passed #374960
build_ubuntu_16_04

00:01:36