Sometimes it is useful to capture log messages in a way that is easy for
the running program to introspect or manually handle.
*BufferLogAppender* captures the logs in a simple array.
Be careful, there is no default flush/clear mechanism that runs
automatically. Users of BufferLogAppender should take care to
render/handle log messages and periodically call `clearBuffer` on the
*BufferLogAppender* instance to avoid the buffer array growing without
limit.
