org.acmicpc.presentation.core.internal

Contains internal classes for presentation manager:
 -PresentationWindow is the window class for rendering presentations on screen,
   double-buffering, handling time and frame-rate 
 -Trace is a helper class for tracing

For OSGi (i.e. Eclipse runtime) support:
 -plugin class
 -category, presentation wrapper, property & data source wrapper are all used to
   load extension points