MySensors 1.4 release

- Added support for 1.4 (1.3 is not supported anymore).
- Added support for batteryLevel
- Added more variable types with 'native' states instead of generic states:
 # TEMP
 # HUM
 # PRESSURE
 # RAIN
 # RAINRATE
 # WIND
 # GUST
 # UV
 # DISTANCE
 # TRIPPED
 # HEATER_SW
 # LIGHT_LEVEL
- Added menu item to remove failed devices
- Added menu item to remove unused device
- Cleaned up and optimized code

Signed-off-by: Marcel Trapman <marceltrapman@it2be.com>