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/util_common.h

@@ -5,18 +5,53 @@
 #ifndef WVCDM_UTIL_UTIL_COMMON_H_
 #define WVCDM_UTIL_UTIL_COMMON_H_
 
+// This section deals with defines that are platform-specific.
+
 #ifdef _WIN32
+
 #  ifdef CORE_UTIL_IMPLEMENTATION
 #    define CORE_UTIL_EXPORT __declspec(dllexport)
 #  else
 #    define CORE_UTIL_EXPORT __declspec(dllimport)
 #  endif
+
+#  define CORE_UTIL_IGNORE_DEPRECATED
+#  define CORE_UTIL_RESTORE_WARNINGS
+
 #else
+
 #  ifdef CORE_UTIL_IMPLEMENTATION
 #    define CORE_UTIL_EXPORT __attribute__((visibility("default")))
 #  else
 #    define CORE_UTIL_EXPORT
 #  endif
+
+#  ifdef __GNUC__
+#    define CORE_UTIL_IGNORE_DEPRECATED \
+      _Pragma("GCC diagnostic push")    \
+          _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
+#    define CORE_UTIL_RESTORE_WARNINGS _Pragma("GCC diagnostic pop")
+#  else
+#    define CORE_UTIL_IGNORE_DEPRECATED
+#    define CORE_UTIL_RESTORE_WARNINGS
+#  endif
+
+#endif
+
+// This section deals with attribute-detection and is platform-agnostic.
+
+#if !defined(__has_cpp_attribute)
+#  define __has_cpp_attribute(x) 0
+#endif
+
+#if __has_cpp_attribute(fallthrough)
+#  define CORE_UTIL_FALLTHROUGH [[fallthrough]]
+#elif __has_cpp_attribute(clang::fallthrough)
+#  define CORE_UTIL_FALLTHROUGH [[clang::fallthrough]]
+#elif __has_cpp_attribute(gnu::fallthrough)
+#  define CORE_UTIL_FALLTHROUGH [[gnu::fallthrough]]
+#else
+#  define CORE_UTIL_FALLTHROUGH
 #endif
 
 #endif  // WVCDM_UTIL_UTIL_COMMON_H_