Added Sensor detection on boot 

Added smoke sensor MQ2 - Tests ppm and checks air quality while reading temperatures 

Updated Intro screen to include mode, smoke MQ2, Alarm state.

typical dump from board 

Smoke Sensor Installed
Smoke Sensor Reading :343
Concentration of gas 
LPG: 522 ppm
CO: 17465 ppm
Smoke: 1917 ppm
00Reading Mode type :0
Storing Mode type :0
Checking for Sensors connected to the board
Error Check Sensors - Not Connected 
Error Check Sensors - Not Connected 
Error Check Sensors - Not Connected 
Error Check Sensors - Not Connected 
Error Check Sensors - Not Connected 
Error Check Sensors - Not Connected