removed SD from ADK2 to avoid conflict
Moved Serial init to allow debug to be done on init code
No redraw for slider needed at initialization
Changed pingSerial to SendCMD instead of SendData to try to increase drawing speed
Added calibration for multi channel water level
close #121
Added Temp Memory variables
close #124
Changed Temporary memory code to use Custom Variables instead.
issue #124
Nokia DrawImage fix for Gen3 screens
Added Ethernet code for RA Star
Improved performance of the menu drawing
Merge pull request #2 from reefangel/dev

merge fork
Merge remote-tracking branch 'origin/dev' into wifi
Refactored RA_Wifi to remove methods from the global scope and make
methods re-usable.