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/rw_lock.h

@@ -13,7 +13,7 @@
 #include "disallow_copy_and_assign.h"
 #include "util_common.h"
 
-namespace wvcdm {
+namespace wvutil {
 
 // A simple reader-writer mutex implementation that mimics the one from C++17
 class CORE_UTIL_EXPORT shared_mutex {
@@ -60,6 +60,6 @@ class shared_lock {
   CORE_DISALLOW_COPY_AND_ASSIGN(shared_lock);
 };
 
-}  // namespace wvcdm
+}  // namespace wvutil
 
 #endif  // WVCDM_UTIL_RW_LOCK_H_