Squashed 'core/' changes from d6fe1d9..46177b7

46177b7 Cont'd working on OAuth stuff. Works well with Dropbox plugin
b896527 Add  annotation and add to CLI flow
REVERT: d6fe1d9 Added workaround for 'connect' via GUI with syncany:// link, relates to #297
REVERT: 6c3a8ba A first shot at the WebSocketUserInteractionListener
REVERT: b8aa466 Make CipherSpec default constructor (to allow serialization); relates to #297
REVERT: 0820c08 Added skeleton InitManagementRequest/Response, relates to #297

git-subtree-dir: core
git-subtree-split: 46177b72fa581acbb8877ea6ceed7970e0442605
Merge commit 'c21055401f17cb5315f917380966a15f3bbd13a1' into feature/issue297-wizard