[LPM] ESP8266 and DS1820 DeepSleep (#1591)

Add support for the ESP8266 deep sleep and required change for DS1820 sensor used in my project.

Allow defining DS1820_RESOLUTION and DS1820_INTERVAL_SEC in ENVIRON without editing config file.

Allow DTimeBetweenReadingmq2 Env. MACRO change without editing source config file.

Added some an example ENVIRONMENTS

Add ESP8266_DEEP_SLEEP_IN_US to nodemcuv2-all-test

environments.ini

@@ -1117,6 +1117,7 @@ build_flags =
   ;'-DZgatewayWeatherStation="WeatherStation"'
   '-DsimplePublishing=true'
   '-DGateway_Name="OpenMQTTGateway_ESP8266_ALL"'
+  '-DESP8266_DEEP_SLEEP_IN_US=120000000'
 board_build.flash_mode = dout
 
 [env:nodemcuv2-fastled-test]