r173: Register/bind commands

[Tybor]

It's for the /help plugin or any other plugin that might be curious about the commands a certain plugin uses. The /help plugin needs to be aware of the permissions, otherwise it can't filter out commands the player can't use.

So why not just let the server check permission if it already gets this information?
This would ease the use of commands a little bit more.
If no permission is provided, you can still check them by yourself.

greets,
Tybor