merge in latest libebus commit 9520d5a3283472c2a53b8396b0796723f660bed7:
simplified SymbolString interface and let it handle unescaping itself
merge in latest libebus commit 9520d5a3283472c2a53b8396b0796723f660bed7:
simplified recvSlaveDataAndCRC, adjusted tot nicer SymbolString, add error description to getMessageStr()
merge in latest libebus commit 9520d5a3283472c2a53b8396b0796723f660bed7:
started new DataField classes
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