Encrypt the unique id when usign a external web service

[lukbukkit]

Is your feature request related to a problem? Please describe.
At the moment the Teamspeak unique id is just passed as a parameter to a external web service, but everyone can insert a unique id of another user and change their settings.

Describe the solution you'd like
We could encrypt the parameter uid and create a entry in the configuration for the encryption.
Another soulution could be to replace the uid parameter with a token.
This token can be saved in the database and read by the external web application.