First version of Drooms Swing GUI

First version of swing application used to replay the game loaded from XML report.
Features:
 * loading and parsing specified XML report
 * rendering the playground and players
 * manually stepping through the game
 * continues replay (delay between turns adjustable)
 * current player score is shown next to player name
 * reseting (restarting) the game

Building and running the application: 
App is written in Scala, but Scala does not have to be installed in order to run it. Execute 'mvn package' in 'drooms-swing-gui' dir and the resulting jar will be stored in target dir. Then just run it: java -jar target/drooms-swing-gui-<version>-jar-with-dependencies.jar