Refactor classes to be Medtronic640g classes, rather than the legacy "DexcomG4" classes.

.idea/workspace.xml

app/app.iml

app/build.gradle

app/src/main/AndroidManifest.xml

...ain/java/info/nightscout/android/USB/CommonUsbDriver.java

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

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

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

...c/main/java/info/nightscout/android/USB/UsbHidDriver.java

...c/main/java/info/nightscout/android/dexcom/CSVWriter.java

.../java/info/nightscout/android/dexcom/DexcomG4Service.java

...ain/java/info/nightscout/android/dexcom/DexcomReader.java

...c/main/java/info/nightscout/android/dexcom/EGVRecord.java

.../java/info/nightscout/android/dexcom/ResultSetHelper.java

...nfo/nightscout/android/dexcom/ResultSetHelperService.java

...nfo/nightscout/android/dexcom/USB/CdcAcmSerialDriver.java

.../nightscout/android/dexcom/USB/CommonUsbSerialDriver.java

...main/java/info/nightscout/android/dexcom/USB/HexDump.java

...ghtscout/android/dexcom/USB/SerialInputOutputManager.java

...a/info/nightscout/android/dexcom/USB/UsbSerialDriver.java