String preprocessing before tcpkali json2cbor encoding
String preprocessing before tcpkali json2cbor encoding

- escape backslashes
- replace {message-marker} with longer version to prevent bad cbor
  generation

timofey-barmin/mzbench,timofey-barmin/mzbench,timofey-barmin/mzbench,timofey-barmin/mzbench,machinezone/mzbench,machinezone/mzbench,machinezone/mzbench,machinezone/mzbench,machinezone/mzbench,timofey-barmin/mzbench