The DataViewport was changing the size of Visualizers,
even when they were placed in their own DocumentWindow,
because "destroyTab" was only removing the tab from the
TabbedButtonBar, rather than the TabbedComponent.

The Visualizer class no longer inherents from OpenGLCanvas. In the future,
scrolling will be handled by a Viewport object.

Using ScopedPointers was causing memory leaks. It's worth tracking
down the source of these in the future, but for now, we'll leave
the code as it was before.

Use the following command to update the copyright year in all files,
starting in the Source/ directory:

find . -type f -print0 | xargs -0
   sed -i 's/Copyright (C) 2012/Copyright (C) 2013/g'

Works like a charm!

Added some comments and removed deprecated code.

MainWindow now points to the ProcessorGraph and AudioComponent
with ScopedPointers. deleteAndZero must no longer be called
in the destructor.

The main UI components now use ScopedPointers for their children,
alleviating the need to call "deleteAllChildren" or "deleteAndZero"
in the destructor.