Initial Code Drop

This is the initial code drop of the reference implementation and
test cases for the Widevine Whitebox API.

In this drop, the full reference implementation for the AEAD
white-box is provided and all test cases verifying the top-level
behave have are enabled. Since the implementations can vary so much
the testing is mostly left to verifying the return codes for specific
parameter conditions.

A full reference implementation for the license white-box is provided,
however not all tests are implemented or enabled. A number of tests
have been disabled as they required a loaded license and test licenses
are still being worked on.

The two license white-box API functions that are the further from
competition are ProcessLicenseResponse() and MaskedDecryt().
ProcessLicenseResponse() is still being worked on and MaskedDecrypt()
is waiting on Decrypt() to be fully functional.

Most tests focus on verifying return code for specific parameter
conditions, but as test licenses are created, tests looking to test
the internal behaviour of license management will be added to
ProcessLicenseResponse(), Decrypt(), and MaskedDecrypt().

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