* bindings/vapi/javascriptcore-4.0.vapi (Object::get_property): Fix
  return type.

* src/client/conversation-viewer/conversation-message.vala (GtkTemplate):
  Hook up to new deceptive_link_clicked signal, remove old DOM-based
  implementation.

* src/client/conversation-viewer/conversation-web-view.vala
  (ConversationWebView): Add new deceptive_link_clicked signal and
  DeceptiveText enum, listen for deceptiveLinkClicked JS message and fire
  signal when received.

* src/client/util/util-webkit.vala (WebKitUtil): Add to_object util function.

* src/engine/util/util-js.vala (Geary.JS): Add to_object and get_property
  util functions.

* ui/conversation-web-view.js (ConversationPageState) Listen for link
  clicks, check for deceptive text and send message if found. Add unit
  tests for deceptive text check.

* test/js/composer-page-state-test.vala: Move ::run_javascript to parent
  class so new ConversationPageStateTest class can use it, adapt call
  sites to different parent signature.