Squashed 'core/' changes from 118bb55..79ef98f

79ef98f Replace UserInteractionListener.onShowMessage with 'ShowMessageExternalEvent'

git-subtree-dir: core
git-subtree-split: 79ef98f2a1fe3f106d442de4b71a020b48735207
Merge commit 'c92bdb0f36fdc72f47f1431f5e17d722d87c122d' into feature/issue297-wizard
Squashed 'core/' changes from 79ef98f..dde87e5

dde87e5 Remove obsolete double initialization

git-subtree-dir: core
git-subtree-split: dde87e59a29a9dddb9bdf25ae5775ca96545e790
Merge commit '7957652dd3d14f1aa8b07949ffdad7d160051c68' into feature/issue297-wizard
Make syncany:// link selection in GUI possible
Success panel for 'Init'.