Added Timer class and fixed #127 #131 #107 #105

* Added functions to get sleep mode from NM

* Implemented Timer class

* Commented the Timer class

* Improved Timer class

* Replaced battery report with Timer

* Using Timer in SensorRainGauge class

* Add custom report time to Sensor

* Used Timer for force update

* Added safeguard to SensorDigitalOutput

* Added capability to turn on with a timer for SensorDigitalOutput

* Tested all the new functions and fixed the issues

* Stopping the timer if setInputIsElapsed is on and a LOW value is set