Android CI with Unit Testing

[hmelder]

It turns out that the support for Android unit testing is really poor in CMake and cannot be easily integrated into our existing build system.

I opted to write two small shell scripts. One for patching and uploading the shared libraries, test binaries, and android_test_driver.sh to a running Android Emulator. android_test_driver.sh is the second script. It is directly executed on the emulator and executes all unit tests.

Future improvements:

• Caching of emulator to speed-up testing time
• Add more architectures