JK-47 Send Cargo No and User Url for BTC Send
  - added mail_send_cargo_no_and_user_url_for_btc_send.html
  - updated send_cargo_no_and_user_url_for_btc_send function
  - renamed mail_comes_shipping.html from mail_come_shipping.html
  - renamed mail_sends_shipping.html from mail_send_shipping.html
  - renamed mail_user_activation from mail_activation.html
  - renamed mail_vote_activation from mail_vote.html
  - updated: mail function in cargo_control