[txyvwfba] Console widget

Create a graphical widget which accepts lines of text, which get printed in order they are received.  This almost certainly already exists.  Some further possible sophistications:

• Scrollable.
• Line wrap.
• Line numbers.
• Time stamps.
• Color and fonts.
• Images.
• Truncation of large lines or images to avoid flooding the console.
• Allow clients to organize output hierarchically instead of simply serial lines.
• Overwrite instead of scroll.