DIRTY merge: Merge code from high power partitino into low power partition

* NOTE: several limitations have been observed:
  * Arduino Serial seems to be incompatibel with tickless light sleep mode
    --> check that in combination with other logging functions

Author: LIFsCode

eloc610LowPowerPartition/lib/esp32Time/LICENSE

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+MIT License
+
+Copyright (c) 2021 Felix Biego
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

eloc610LowPowerPartition/lib/esp32Time/README.md

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+# ESP32Time
+An Arduino library for setting and retrieving internal RTC time on ESP32 boards
+
+[![arduino-library-badge](https://www.ardu-badge.com/badge/ESP32Time.svg?)](https://www.arduinolibraries.info/libraries/esp32-time)
+
+## Functions
+
+```
+setTime(30, 24, 15, 17, 1, 2021);  // 17th Jan 2021 15:24:30
+setTime(1609459200);  // 1st Jan 2021 00:00:00
+
+getTime()          //  (String) 15:24:38
+getDate()          //  (String) Sun, Jan 17 2021
+getDate(true)      //  (String) Sunday, January 17 2021
+getDateTime()      //  (String) Sun, Jan 17 2021 15:24:38
+getDateTime(true)  //  (String) Sunday, January 17 2021 15:24:38
+getTimeDate()      //  (String) 15:24:38 Sun, Jan 17 2021
+getTimeDate(true)  //  (String) 15:24:38 Sunday, January 17 2021
+
+getMicros()        //  (long)    723546
+getMillis()        //  (long)    723
+getEpoch()         //  (long)    1609459200
+getSecond()        //  (int)     38    (0-59)
+getMinute()        //  (int)     24    (0-59)
+getHour()          //  (int)     3     (0-12)
+getHour(true)      //  (int)     15    (0-23)
+getAmPm()          //  (String)  pm
+getAmPm(true)      //  (String)  PM
+getDay()           //  (int)     17    (1-31)
+getDayofWeek()     //  (int)     0     (0-6)
+getDayofYear()     //  (int)     16    (0-365)
+getMonth()         //  (int)     0     (0-11)
+getYear()          //  (int)     2021
+
+getTime("%A, %B %d %Y %H:%M:%S")   // (String) returns time with specified format 
+```
+[`Formatting options`](http://www.cplusplus.com/reference/ctime/strftime/)

eloc610LowPowerPartition/lib/esp32Time/keywords.txt

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+ESP32Time		KEYWORD1
+
+setTime			KEYWORD2
+getTime			KEYWORD2
+getTimeStruct	KEYWORD2
+getDateTime		KEYWORD2
+getTimeDate		KEYWORD2
+getDate			KEYWORD2
+getAmPm			KEYWORD2
+getMillis		KEYWORD2
+getMicros   KEYWORD2
+getEpoch    KEYWORD2
+getSecond		KEYWORD2
+getMinute		KEYWORD2
+getHour			KEYWORD2
+getDay			KEYWORD2
+getDayofWeek	KEYWORD2
+getDayofYear	KEYWORD2
+getMonth		KEYWORD2
+getYear			KEYWORD2

eloc610LowPowerPartition/lib/esp32Time/library.json

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+{
+  "name": "ESP32Time",
+  "version": "1.0.3",
+  "keywords": "Arduino, ESP32, Time, Internal RTC",
+  "description": "An Arduino library for setting and retrieving internal RTC time on ESP32 boards",
+  "repository":
+  {
+    "type": "git",
+    "url": "https://github.com/fbiego/ESP32Time"
+  },
+  "authors":
+  [
+    {
+        "name": "fbiego",
+        "email": "[email protected]",
+        "maintainer": true
+    }
+  ],
+  "frameworks": "arduino",
+  "platforms": "espressif8266, espressif32"
+}

eloc610LowPowerPartition/lib/esp32Time/library.properties

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+name=ESP32Time
+version=1.0.3
+author=fbiego
+maintainer=fbiego
+sentence=Set and retrieve internal RTC time on ESP32 boards.
+paragraph=No need for external RTC module or NTP time synchronization.
+category=Timing
+url=https://github.com/fbiego/ESP32Time
+architectures=*
+includes=ESP32Time.h
+