WebSMS: Fishtext Connector

此版本中的新功能：Rewrote sending and balance checking logic to optimise bandwidth usage. Automatically truncate and warn users when they enter passwords longer than 12 characters. Improve error messages when incorrect recipient numbers are used. Notify the user on successful send with the send cost (can be turned off in fishtext preferences). Fixed pound sign display for UK STG balances. Changed connector maintainer and owner.