improve

1. distinguish SCPI abbreviations, for example, INPUT"SYST:VERS?", but
result is **ERROR: -113, "Undefined header"; now it can distinguish SCPI
abbreviations  and INPUT"SYST:VERS?", the result is "receive SCPI CMD:
SYST:VERS?
v1.0".
2. It can skip the first colon. For example , "SYST:VERS?" ==
":SYST:VERS?".
3. add newly demo for using these function of SCPI_ParamInt,
SCPI_ParamDouble, SCPI_ParamNumber, SCPI_ParamDouble, SCPI_ParamString,
SCPI_ResultInt, SCPI_ResultDouble, SCPI_ResultText,
SCPI_ResultString.