Implement Multiharp data formats

[alkaid7777]

From the offical Read_PTU.m code (MATLAB version), MultiHarp use the same "ReadHT2" function as HydraHarp and TimeHarp260

% choose right decode function
switch TTResultFormat_TTTRRecType;
case rtPicoHarpT3
ReadPT3;
....
....
case {rtMultiHarpNT3, rtHydraHarp2T3, rtTimeHarp260NT3, rtTimeHarp260PT3}
isT2 = false;
ReadHT3(2);
case {rtMultiHarpNT2, rtHydraHarp2T2, rtTimeHarp260NT2, rtTimeHarp260PT2}
isT2 = true;
ReadHT2(2);
....

[tsbischof]

I would be glad to take a pass at this, do you have sample data from the MultiHarp? If so, I would like to add it to https://github.com/tsbischof/picoquant-sample-data and use it to test this library before release