Support OTA and model level commands #40

Job	Run time
build (examples/ACUnit)	3m 26s
build (examples/AirQualitySensor/AirQualitySensor)	3m 30s
build (examples/Blinds)	3m 38s
build (examples/ContactSensor)	3m 39s
build (examples/DimSwitch)	3m 23s
build (examples/doorbell)	3m 28s
build (examples/Fan)	3m 24s
build (examples/GarageDoor)	3m 22s
build (examples/Light/Light)	3m 27s
build (examples/Lock/Lock)	3m 25s
build (examples/Lock/Lock_with_feedback)	3m 28s
build (examples/MotionSensor)	3m 20s
build (examples/PowerSensor)	4m 16s
build (examples/Relay/MultiRelays_advance)	3m 40s
build (examples/Relay/Relay)	3m 40s
build (examples/Speaker)	3m 21s
build (examples/Switch/MultiSwitch_advance)	3m 39s
build (examples/Switch/MultiSwitch_beginner)	4m 9s
build (examples/Switch/MultiSwitch_intermediate)	3m 27s
build (examples/Switch/Switch)	3m 25s
build (examples/Thermostat)	3m 41s
build (examples/TV)	3m 43s
	1h 18m 31s

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