API "Hook" for signup

[tm1978]

An API hook for signup on the main website should be added. This way members are also signed up on the site the chatroom belongs to.

Needed is the following:

- check if username exists in other user database and is valid
- check if email address exists in other user database
- trigger to send confirmation email or pass text for confirmation mail
- pass all validated user-data from the successful signup to the interface for signup on main website (including ip address, user-agent....)

[admin]

Thank you, we will discuss about it.