[m] make f_state boolean
Make encode method abstract
[m] Tidy up
Complete ITF14 > OOP
Pull values into Code 11 object
Pull values into Codabar object
Pull values into Code 3 of 9 object
Pull values into MSI Plessey
Pull values into Extended Code 3 of 9
Pull values into Code 49
Pull values into Code 93
Pull values into LOGMARS
Pull values into PZN & Telepen