Initial v17 Release

Headers and Unit tests have been updated to match the v17 spec.

Documentation can be found here:
https://developers.devsite.corp.google.com/widevine/drm/client/oemcrypto/v17

util/include/clock.h

@@ -9,7 +9,7 @@
 
 #include <stdint.h>
 
-namespace wvcdm {
+namespace wvutil {
 
 // Provides time related information. The implementation is platform dependent.
 class Clock {
@@ -21,6 +21,6 @@ class Clock {
   virtual int64_t GetCurrentTime();
 };
 
-}  // namespace wvcdm
+}  // namespace wvutil
 
 #endif  // WVCDM_UTIL_CLOCK_H_