Merge recent doc changes for OEMCrypto

This is a cherry pick of recent changes to OEMCrypto and ODK. Most of
these are part of the document migration to doxygen.

See http://go/wvgerrit/106005 and its parents for code reviews.

Bug: 144715340
Bug: 148232693
Bug: 167580674
Change-Id: I658f99c8117b974faed97322d61fac0f382283af

libwvdrmengine/oemcrypto/test/fuzz_tests/oemcrypto_generate_signature.cc

@@ -0,0 +1,36 @@
+#include "properties.h"
+#include "oemcrypto_session_tests_helper.h"
+
+using namespace wvoec;
+
+static bool is_init = false;
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  SessionUtil session_helper;
+  if (!is_init) {
+    wvoec::global_features.Initialize();
+    wvoec::global_features.RestrictFilter("*");
+    wvcdm::Properties::Init();
+    is_init = true;
+  }
+
+  OEMCrypto_Initialize();
+  session_helper.EnsureTestKeys();
+
+  Session s;
+  s.open();
+  s.GenerateDerivedKeysFromKeybox(session_helper.keybox_);
+
+  static const uint32_t SignatureBufferMaxLength = size;
+  vector<uint8_t> signature(SignatureBufferMaxLength);
+  size_t signature_length = signature.size();
+
+  OEMCryptoResult sts;
+  sts = OEMCrypto_GenerateSignature(s.session_id(), data, size,
+                                    &signature[0], &signature_length);
+
+  s.close();
+  OEMCrypto_Terminate();
+
+  return 0;
+}