New variables

Variable	Description
foxyproxy.proxies.username `UNIX user` `standard` `mandatory` `disabled`	Username. Mandatory: when the variable "Password" hasn't the value "null". Disabled: if type not in: - HTTP - HTTPS/SSL - SOCKS4 - SOCKS5.
foxyproxy.proxies.password `secret` `standard` `disabled`	Password. Disabled: if type not in: - HTTP - HTTPS/SSL - SOCKS4 - SOCKS5.