Add libbej encoder wrapper for C++

Add unit tests and the test data files needed for unit tests.
Move APIs from bej_decoder_test.cpp to a common file, to share those
with bej_encoder_test.cpp

Teste

Add libbej encoder wrapper for C++

Add unit tests and the test data files needed for unit tests.
Move APIs from bej_decoder_test.cpp to a common file, to share those
with bej_encoder_test.cpp

Tested:
Verified that encoding using the wrapper works well at runtime.
Verified that the unit tests pass.

Change-Id: I61b7c17690eb7e7fefd1973a22d4316c6214267e
Signed-off-by: Nikhil Namjoshi <nikhilnamjoshi@google.com>

show more ...