Add getAlarmEpoch() method and fix warning on compiling with oldTime.RTC_MODE2_CLOCK_Type::reg

[JeromeBriot]

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Add getAlarmEpoch() method : https://github.com/arduino-libraries/RTCZero/issues/60

Fix warning on compiling with oldTime.RTC_MODE2_CLOCK_Type::reg : https://github.com/arduino-libraries/RTCZero/issues/67

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[JeromeBriot]

I forgot to add getAlarmEpoch in keywords.txt

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Memory usage change @ 06db30fab095da20761c3d6a4523ab0e15cfcad6

Board	flash	%	RAM for global variables	%
arduino:samd:arduino_zero_edbg	:small_red_triangle: +4 - +12	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkr1000	:small_red_triangle: +4 - +12	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrfox1200	:small_red_triangle: +4 - +12	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrgsm1400	:small_red_triangle: +4 - +12	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrnb1500	:small_red_triangle: +4 - +12	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrvidor4000	:small_red_triangle: +4 - +12	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrwan1300	:small_red_triangle: +4 - +12	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrwan1310	:small_red_triangle: +4 - +12	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrwifi1010	:small_red_triangle: +4 - +12	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrzero	:small_red_triangle: +4 - +12	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:nano_33_iot	:small_red_triangle: 0 - +8	0.0 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board	examples/Epoch flash	%	examples/Epoch RAM for global variables	%	examples/SimpleRTC flash	%	examples/SimpleRTC RAM for global variables	%	examples/SimpleRTCAlarm flash	%	examples/SimpleRTCAlarm RAM for global variables	%	examples/SleepRTCAlarm flash	%	examples/SleepRTCAlarm RAM for global variables	%
arduino:samd:arduino_zero_edbg	4	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0
arduino:samd:mkr1000	4	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0
arduino:samd:mkrfox1200	4	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0
arduino:samd:mkrgsm1400	4	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0
arduino:samd:mkrnb1500	4	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0
arduino:samd:mkrvidor4000	4	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0
arduino:samd:mkrwan1300	4	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0
arduino:samd:mkrwan1310	4	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0
arduino:samd:mkrwifi1010	4	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0
arduino:samd:mkrzero	4	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0	12	0.0	0	0.0
arduino:samd:nano_33_iot	0	0.0	0	0.0	8	0.0	0	0.0	8	0.0	0	0.0	8	0.0	0	0.0

Click for full report CSV

Board,examples/Epoch<br>flash,%,examples/Epoch<br>RAM for global variables,%,examples/SimpleRTC<br>flash,%,examples/SimpleRTC<br>RAM for global variables,%,examples/SimpleRTCAlarm<br>flash,%,examples/SimpleRTCAlarm<br>RAM for global variables,%,examples/SleepRTCAlarm<br>flash,%,examples/SleepRTCAlarm<br>RAM for global variables,%
arduino:samd:arduino_zero_edbg,4,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0
arduino:samd:mkr1000,4,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0
arduino:samd:mkrfox1200,4,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0
arduino:samd:mkrgsm1400,4,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0
arduino:samd:mkrnb1500,4,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0
arduino:samd:mkrvidor4000,4,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0
arduino:samd:mkrwan1300,4,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0
arduino:samd:mkrwan1310,4,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0
arduino:samd:mkrwifi1010,4,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0
arduino:samd:mkrzero,4,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0,12,0.0,0,0.0
arduino:samd:nano_33_iot,0,0.0,0,0.0,8,0.0,0,0.0,8,0.0,0,0.0,8,0.0,0,0.0