Finally, the mail system has been added

I just pushed update #10 that includes the mail system. Most games have this kind of system and it should help a lot communication and guild management.

Now that the system is added, it will link others like player merchants, guild application and /report command later. It opens a lot of possibilities.

Should have been there from the start, yes... Like probably a lot of stuff. But hey! It's there now ;-) Enjoy!