Fixed several AI bugs, added log system

- Fixes 0000031: Incap is not working correctly
- NPC AI now considers deathblow values correctly
- AI state transition further debugged
- Pet now follows owner after killing attacker
- Added debug log system
- Cleaned up system console from system.out messages

src/tools/CharonPacketLogger.java

@@ -0,0 +1,60 @@
+package tools;
+
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.nio.file.*;
+
+public class CharonPacketLogger extends Thread {
+	  private static final CharonPacketLogger instance = new CharonPacketLogger();
+	  
+	  private BlockingQueue<String> itemsToLog =
+			    new ArrayBlockingQueue<String>(100);
+	  
+	  private static final String SHUTDOWN_REQ = "SHUTDOWN";
+	  private volatile boolean shuttingDown, loggerTerminated;
+	  
+	  public static CharonPacketLogger getLogger() {
+	    return instance;
+	  }
+	  private CharonPacketLogger() {
+	    start();
+	  }
+	  
+	  public void run() {
+		    try {
+		      String item;
+		      while ((item = itemsToLog.take()) != SHUTDOWN_REQ) {
+		        System.out.println(item);
+		      }
+		    } catch (InterruptedException iex) {
+		    } finally {
+		      loggerTerminated = true;
+		    }
+	  }
+	  
+	  public void log(String str) {
+		    if (shuttingDown || loggerTerminated) return;
+		    try {
+		      itemsToLog.put(str);
+		    } catch (InterruptedException iex) {
+		      Thread.currentThread().interrupt();
+		      throw new RuntimeException("Unexpected interruption");
+		    }
+	  }
+	  
+	  public void log(String str,Path path) {
+		    if (shuttingDown || loggerTerminated) return;
+		    try {
+		      itemsToLog.put(str);
+		      CharonPacketUtils.appendToLog(str, path);
+		    } catch (InterruptedException iex) {
+		      Thread.currentThread().interrupt();
+		      throw new RuntimeException("Unexpected interruption");
+		    }
+	  }
+	  
+	  public void shutDown() throws InterruptedException {
+		  shuttingDown = true;
+		  itemsToLog.put(SHUTDOWN_REQ);
+	  }
+}