CustomNPCs saves its data on EntityPlayer.writeToNBT(), this is wrong! about customnpc-plus

[EverNife]

If nothing is possible, just saving the file assync might solve 99% of the problem

Something like this:

	private static Executor executor = Executors.newSingleThreadExecutor();
	public void savePlayerData(PlayerData data){
		NBTTagCompound compound = data.getNBT();
		executor.execute(() -> {
			String filename = data.uuid + ".json";
			try {
				File saveDir = getSaveDir();
				File file = new File(saveDir, filename+"_new");
				File file1 = new File(saveDir, filename);
				NBTJsonUtil.SaveFile(file, compound);
				if(file1.exists()){
					file1.delete();
				}
				file.renameTo(file1);
			} catch (Exception e) {
				LogWriter.except(e);
			}
		});
	}
	```