Allow to use RTC instead of TimeLib.#18

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DCEM wants to merge 5 commits intothijse:masterfrom

Commits on Apr 6, 2020

Add EnableInputPullup to DCF77 constructor
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Commits on Apr 8, 2020

Change expamles to use board-independet macros.
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Allow to use RTC instead of TimeLib
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Update library.properties
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Commits on Apr 15, 2020

Remove - #include "TimeLib.h" from ZeroRTCSync example
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