[APP] Android RPC (#359)

* [APP] Android RPC first version

* [APP] Android RPC build jni automatically

* [APP] Android OpenCL RPC tested on real devices

* [APP] optimize android app interface. add ndk compile tool

* add ndk compile tool

* [APP] fix android app thread crash; add android test script

* [APP] android app - show alert dialog and disconnect when error occurs

* fix ndk build script code lint

* fix ndk build default argument

* ndk script build remove shell=True. disable android app screen orientation