Removed code using <time.h> non-core library (ie. Epoch stuff)

I hate to undo even a little bit of Adam's good work, but in the interests of a robust core, I think it's best the references to time.h are removed, and the Epoch set/get along with it.

RTC.cpp included <time.h>, which caused a compilation error when these are also included in code:
#include <Time.h>
#include <TimeLib.h>

Some possible issues with Window lack of case sensitivity, refer here: https://forum.arduino.cc/index.php?topic=451360.0

Also with time.h (or Time.h?) being an optional extra install library to the Arduino IDE, best to leave it out of the core, especially if it can cause compilation errors.

Author: stephenf7072

Diff for: libraries/RTC/examples/Example4_Set_Epoch/Example4_Set_Epoch.ino

@@ -13,11 +13,9 @@ RTC	KEYWORD1
 #######################################
 
 getTime	KEYWORD2
-getEpoch	KEYWORD2
 
 setTime	KEYWORD2
 setTimeToCompiler	KEYWORD2
-setEpoch	KEYWORD2
 
 getAlarm	KEYWORD2
 setAlarm	KEYWORD2

Diff for: libraries/RTC/keywords.txt

@@ -3,7 +3,6 @@
 */
 
 #include "RTC.h"
-#include <time.h>
 
 am_hal_rtc_time_t hal_time;
 am_hal_rtc_time_t alm_time;
@@ -89,28 +88,6 @@ void APM3_RTC::setToCompilerTime()
   getTime();
 }
 
-void APM3_RTC::setEpoch(uint32_t ts)
-{
-  if (ts < EPOCH_TIME) {
-    ts = EPOCH_TIME;
-  }
-
-  struct tm tm;
-
-  time_t t = ts;
-  struct tm* tmp = gmtime(&t);
-  hal_time.ui32Weekday = 0;
-  hal_time.ui32Century = 0;
-  hal_time.ui32Year = tmp->tm_year - 100;
-  hal_time.ui32Month = tmp->tm_mon + 1;
-  hal_time.ui32DayOfMonth = tmp->tm_mday;
-  hal_time.ui32Hour = tmp->tm_hour;
-  hal_time.ui32Minute = tmp->tm_min;
-  hal_time.ui32Second = tmp->tm_sec;
-  hal_time.ui32Hundredths = 0;
-
-  am_hal_rtc_time_set(&hal_time); //Initialize the RTC with this date/time
-}
 
 void APM3_RTC::getTime()
 {
@@ -127,24 +104,6 @@ void APM3_RTC::getTime()
   hundredths = hal_time.ui32Hundredths;
 }
 
-uint32_t APM3_RTC::getEpoch()
-{
-  am_hal_rtc_time_get(&hal_time);
-
-  struct tm tm;
-
-  tm.tm_isdst = -1;
-  tm.tm_yday = 0;
-  tm.tm_wday = 0;
-  tm.tm_year = hal_time.ui32Year + 100; //Number of years since 1900.
-  tm.tm_mon = hal_time.ui32Month - 1; //mktime is expecting 0 to 11 months
-  tm.tm_mday = hal_time.ui32DayOfMonth;
-  tm.tm_hour = hal_time.ui32Hour;
-  tm.tm_min = hal_time.ui32Minute;
-  tm.tm_sec = hal_time.ui32Second;
-
-  return mktime(&tm);
-}
 
 void APM3_RTC::getAlarm()
 {

Diff for: libraries/RTC/src/RTC.cpp

@@ -9,12 +9,10 @@ class APM3_RTC
   APM3_RTC();
 
   void getTime(); //Query the RTC for the current time/date
-  uint32_t getEpoch(); //Return the current RTC time/date as UNIX Epoch time 
 
   void setTime(uint8_t hour, uint8_t min, uint8_t sec, uint8_t hund,
                uint8_t dayOfMonth, uint8_t month, uint16_t year); //Set current time to provided hundredths/seconds/etc
   void setToCompilerTime(); //Set to time when sketch was compiled
-  void setEpoch(uint32_t ts); //Set current time to provided UNIX Epoch time
 
   void getAlarm(); //Query the RTC for the current alarm time/date
   void setAlarm(uint8_t hour, uint8_t min, uint8_t sec, uint8_t hund, uint8_t dayOfMonth, uint8_t month); //Set alarm time to provided hundredths/seconds/etc