refactoring finished (untested)

app/src/main/java/info/nightscout/android/USB/USBPower.java

...info/nightscout/android/medtronic/MedtronicCnlReader.java

...ightscout/android/medtronic/message/BeginEHSMMessage.java

...oid/medtronic/message/ChannelNegotiateRequestMessage.java

...id/medtronic/message/ChannelNegotiateResponseMessage.java

...edtronic/message/ContourNextLinkBinaryRequestMessage.java

...dtronic/message/ContourNextLinkBinaryResponseMessage.java

...roid/medtronic/message/ContourNextLinkCommandMessage.java

...oid/medtronic/message/ContourNextLinkCommandResponse.java

...out/android/medtronic/message/ContourNextLinkMessage.java

...roid/medtronic/message/ContourNextLinkMessageHandler.java

...roid/medtronic/message/ContourNextLinkRequestMessage.java

...oid/medtronic/message/ContourNextLinkResponseMessage.java

...d/medtronic/message/DeviceInfoResponseCommandMessage.java

.../nightscout/android/medtronic/message/EndEHSMMessage.java

...t/android/medtronic/message/MedtronicResponseMessage.java

...roid/medtronic/message/OpenConnectionResponseMessage.java

...oid/medtronic/message/PumpBasalPatternRequestMessage.java

...id/medtronic/message/PumpBasalPatternResponseMessage.java

...t/android/medtronic/message/PumpStatusRequestMessage.java