Got rid of multiple characters per account

I got rid of accounts. Each character now has its own password.

Why did I do this?

1. this simplifies lots of things in the code like banning, permission handling etc.
2. It makes it easier to do registration during the tutorial, because now there is only one name the player needs to make up.
3. I don't expect that many players will create more than one character, because there isn't much reason to do so in my game system.
4. There is no way to stop people from making more than one account anyway, so they are no appropriate method to tell natural persons apart.


The next thing will be to allow players to start the tutorial with an unregistred character. The player will choose a password when the tutorial is over.