Replace C++ with Cmake with GoLang gomobile

* Add ncsmsgo.arr which is the GoLang gomobile part
See: https://gitlab.com/nerzhul/ncsmsgo
* Android-NDK is not needed anymore
* Android app getVersion() now uses the Golang part
* Use the next getLastHTTPStatus() call in getVersion()
* Android app pushSms() now uses the Golang part
* JNI SmsBuffer has been replaced with GoLang aar bindings
-> This permits to remove some java code & increase performance
* Prepare a insecure switch flag to the Golang client