Added Xcode project.
Added window controller.
Added application menu to hide and quit app.
Added MTRandom submodule.
Added "New Diagram" menu item.
Added new diagram panel with cancel and confirm buttons.
Implemented block based method for presenting new diagram panel as a sheet.
Added NSView subclass for rendering voronoi diagram.
Set window content view to voronoi diagram renderer.
UI amends for new diagram panel layout.
Removed NSTabView, replaced with NSPopUpButton.
Added number of sites and number of iterations text fields.
Added text labels for input fields.
Added number formatter for text fields.
Renamed and amended new diagram panel to subclass NSWindowController instead of NSWindow.
Made create diagram window controller property and instantiated with NSPanel.
Added spiral chord text field and label.
Reverted back to NSPanel subclass for create diagram panel.
Implemented panel delegate.

Added typedef for diagram type.
Subclassed and implemented number formatter to restrict text fields to numeric input.