layout: restructure into src/ tests/ android/ scripts/ tools/

- extension/src/{port,platform,codepage} -> src/; native_render -> src/host
  (+ dxt, shaders/); libgr2 -> src/gr2; extension/third_party -> third_party
- extension/tests -> tests/port, libgr2/tests -> tests/gr2
- android-native -> android (build.sh, push-client.sh moved in)
- script -> scripts; tools/40250 -> tools/server; oracle -> tools/granny-oracle;
  perf tools -> tools/perf
- all build trees under build/ (native, release, android, port-gate)
- xrender:: CMake aliases -> mt::; port-map ledger impl paths rewritten

No code changes. ctest 15/15, port_gate macos+android PASS, port_map check 0 errors.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

third_party/cryptopp/trunhash.h

@@ -0,0 +1,63 @@
+// trunhash.h - originally written and placed in the public domain by Wei Dai
+
+/// \file trunhash.h
+/// \brief Classes for truncated hashes
+
+#ifndef CRYPTOPP_TRUNHASH_H
+#define CRYPTOPP_TRUNHASH_H
+
+#include "cryptlib.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+/// \brief Null hash
+/// \details A null hash that conforms to HashTransformation interface
+class NullHash : public HashTransformation
+{
+public:
+	void Update(const byte *input, size_t length)
+		{CRYPTOPP_UNUSED(input);CRYPTOPP_UNUSED(length);}
+	unsigned int DigestSize() const
+		{return 0;}
+	void TruncatedFinal(byte *digest, size_t digestSize)
+		{CRYPTOPP_UNUSED(digest);CRYPTOPP_UNUSED(digestSize);}
+	bool TruncatedVerify(const byte *digest, size_t digestLength)
+		{CRYPTOPP_UNUSED(digest);CRYPTOPP_UNUSED(digestLength);return true;}
+};
+
+/// \brief Construct new HashModule with smaller digest size from an existing one
+/// \tparam T HashTransformation derived class
+template <class T>
+class TruncatedHashTemplate : public HashTransformation
+{
+public:
+	/// \brief Construct a TruncatedHashTemplate
+	TruncatedHashTemplate(T hm, unsigned int digestSize)
+		: m_hm(hm), m_digestSize(digestSize) {}
+	/// \brief Construct a TruncatedHashTemplate
+	TruncatedHashTemplate(const byte *key, size_t keyLength, unsigned int digestSize)
+		: m_hm(key, keyLength), m_digestSize(digestSize) {}
+	/// \brief Construct a TruncatedHashTemplate
+	TruncatedHashTemplate(size_t digestSize)
+		: m_digestSize(digestSize) {}
+
+	void Restart()
+		{m_hm.Restart();}
+	void Update(const byte *input, size_t length)
+		{m_hm.Update(input, length);}
+	unsigned int DigestSize() const {return m_digestSize;}
+	void TruncatedFinal(byte *digest, size_t digestSize)
+		{m_hm.TruncatedFinal(digest, digestSize);}
+	bool TruncatedVerify(const byte *digest, size_t digestLength)
+		{return m_hm.TruncatedVerify(digest, digestLength);}
+
+private:
+	T m_hm;
+	unsigned int m_digestSize;
+};
+
+typedef TruncatedHashTemplate<HashTransformation &> TruncatedHashModule;
+
+NAMESPACE_END
+
+#endif