NNEF-RT + NNAPI

Finish the demo apps that people only have to install the APK files to see they work.

These applications are validated on android 8.1 only.

https://goo.gl/PYbBSh

https://goo.gl/AGFoLi

https://goo.gl/p12Dkx

https://goo.gl/Jzsr5L