Adds automatic shutdown

Closes #7 .
Adds shutdown feature with settings entry

workspace/ts100/src/Settings.c

@@ -52,5 +52,6 @@ void resetSettings() {
 	systemSettings.sensitivity=0x00;			//Default high sensitivity
 	systemSettings.tempCalibration=239;			//Default to their calibration value
 	systemSettings.voltageDiv=144;				//Default divider from schematic
+	systemSettings.ShutdownTime=30;
 }