Added new mdtPortThreadHelper* classes
Adapted mdtPortReadThread to new mdtPortThreadHelper
Adapted mdtPortWriteThread to new mdtPortThreadHelper
Adapted mdtTcpSocketThread to new mdtPortThreadHelper, blocking API (must be changed later
Adapted mdtUsbPortThread to new mdtPortThreadHelper
Some bug corrections in port managers
Adapting mdtUsbtmcPortThread to new mdtPortThreadHelper
Adapting mdtUsbtmcPortThread to new mdtPortThreadHelper
Adapting mdtUsbtmcPortThread to new mdtPortThreadHelper
Working on read timeout problems