added Trident animation library to build.xml.
Added setting to switch gameplay animation on/off. As this is an experimental feature it defaults to off.
added new animation related classes.
added code to play animation when AI draws a card from its library.
refactor: rename method.
arrange gameplay settings using MigLayout.
added new setting to preferences dialog that can be used to switch gameplay animation on/off. Default is off.
ensure FileIO returns image optimized for display.
refactor: extract methods.
remove unnecessary image creation code.
add lib/trident-1.3.jar to classpath