Swing based AWT peers

# Swing based AWT peers.

This package defines an abstract set of AWT peers that is based on Swing widgets. This can be used as an implementation base for peer implementors who don't have access to native widgets or who want to build a quick prototype of a peer set without implementing all of the AWT widgets.

An actual implementation would have to provide the following:

- A concrete implementation of {@link java.awt.Toolkit}, possibly based on {@link SwingToolkit}. This implementation must provide all the missing methods of the `SwingToolkit`.
- Concrete implementations of {@link java.awt.peer.DialogPeer}, {@link java.awt.peer.FramePeer} and {@link java.awt.peer.WindowPeer}, ideally based on their `SwingXXXPeer` counterparts. Some methods must be specially overridden in those peers to provide useful functionality, like `getLocationOnScreen()`. See the API documentation for more details
- An implementation of {@link java.awt.Image}. These must be provided by the toplevel component peers.
- An implementation of {@link java.awt.Graphics}. This must also be provided by the toplevel peers.
- An implementation of {@link java.awt.Font}. This must be provided by the toolkit.