* Addition: Shutdown time setting
* Add a function to change the time setting register
* Add maximum time (64s) setting at initialization
(If you prefer short time settings, set them yourself after initialization)
* Add : powerOFF function
* Fix : Adjusted function name
*setLowCurrentShutdownTime -> setLowPowerShutdownTime
*SleepTime -> ShutdownTime
*SLEEP_xxS -> SHUTDOWN_xxS
Add : powerOFF function
* fix:Detailed setting of wakeup factor
If you set the wakeup time, it will be reflected incorrectly even when it is not needed.
* modify : Exclude functions that don't work properly
*setLowPowerShutdown() -> Add attribute
*setKeepLightLoad() -> Add attribute
* add : add Link
*Add a reference to the official document
* Modify sleep.ino comment
-lightSleep-
*add function for LCD wakeup on LCD class
*add function for lightSleep on Power class
-deepSleep-
*add specification : re-startup time can be specified on deepSleep
-utillity-
*add function :you can get a reason for startup
isResetbyWatchdog(),isResetbyDeepsleep(),isResetbySoftware(),isResetbyPowerSW();
-other-
*add attribution: deprecated function (because moved to Power class.)
M5.setPowerBoostKeepOn(),M5.setWakeupButton(),M5.powerOFF()
*add sample scketch for sleep.