- Move FetchAndAdd to static inner class
      - Remove duplicate classes from i2psnark.war (120KB);
        fixes sporadic FetchAndAdd IllegalAccessError
      - Fix standalone build to include i2psnark.jar since classes
        aren't in the .war anymore
      - Have standalone jetty use I2PAppContext temp directory
      - Replace launch-i2psnark.jar with launch-i2psnark script,
        since RunStandalone is in i2p.jar
      - Clean up jetty-i2psnark.xml, turn off jetty logging
      - Remove standalone build from the pkg target in the main build.xml