Parser for AT commands and similar protocols

Dependencies:   BufferedSerial

Dependents:   ESP8266 Final_Project_2 Final_Project CHEN_Final_Project

Fixed string parser ("%s" reader) and added optional different start delimiter

Solved string parser from "%s" request in vrecv method. Added optional different start delimiter "setDelimiterSend". If not set the ATParser working in conventional mode.

Parser for AT commands and similar protocols AT, parser