IDE: Added koding 3d text markup for terminal splash page.
AppController: Added an existential check.
AppController: `splitTabView` method now accepts options for ideView.
MachineStateModal: Added Terminated state.
MachineStateModal: Emit `IDEBecameReady` event.
IDEView: Return created pane in `createPane_` helper.
WorkspaceTabView: Fixed typo.
AppController: Now IDE opens with a splitted panel has an editor and terminal.