// Register player tracker, for sending configs.
FMLCommonHandler.instance().bus().register(new PlayerTracker());
// Register sapling tracker, for custom tree growth.
SaplingListener saplingListener = new SaplingListener();
MinecraftForge.TERRAIN_GEN_BUS.register(saplingListener);
MinecraftForge.EVENT_BUS.register(saplingListener);
// Register to our own events, so that they can be fired again as
// Forge events.