Requires GTK+ 3.12.
* src/client/conversation-viewer/conversation-message.vala
(ConversationMessage::link_selected): Added to pass through successful
link clicks to the message_viewer, hook it up to the web_view.
(ConversationMessage::load_message_body): Hook up WebKit event handler
for when links are clicked, so phishing links can be intercepted.
(ConversationMessage::on_link_clicked_self): Use a popover to display
phishing warning, recursively check link's offset parent's when
calculating box position, escape link text/href before using it as
markup.
* src/client/conversation-viewer/conversation-viewer.vala
(ConversationViewer::add_message): Ensure unhandled mouse clicks o the
web_view are not used to activate the message's ListBoxRow.
* ui/conversation-message.ui: Add popover (GTK+ 3.12) for phishing links.
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