Dexcom G5 fixes#202

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chrisprad wants to merge 3 commits intonightscout:masterfrom

chrisprad:DexcomG5Fixes

Commits on May 14, 2016

Initial commit of changes to support the Dexcom G5 Receiver
chrisprad
committed
Slight code tidy to handle record updates for EGVRecord and MeterRecord
chrisprad
committed

Commits on Mar 27, 2018

Added support for the Dexcom G5 Touch receiver
chrisprad
committed