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/config.h

@@ -0,0 +1,33 @@
+// config.h - originally written and placed in the public domain by Wei Dai
+
+/// \file config.h
+/// \brief Library configuration file
+/// \details <tt>config.h</tt> was split into components in May 2019 to better
+///  integrate with Autoconf and its feature tests. The splitting occurred so
+///  users could continue to include <tt>config.h</tt> while allowing Autoconf
+///  to write new <tt>config_asm.h</tt> and new <tt>config_cxx.h</tt> using
+///  its feature tests.
+/// \sa <A HREF="https://github.com/weidai11/cryptopp/issues/835">Issue 835,
+///  Make config.h more autoconf friendly</A>,
+///  <A HREF="https://www.cryptopp.com/wiki/Configure.sh">Configure.sh script</A>
+///  on the Crypto++ wiki
+/// \since Crypto++ 8.3
+
+/// \file config.h
+/// \brief Library configuration file
+
+#ifndef CRYPTOPP_CONFIG_H
+#define CRYPTOPP_CONFIG_H
+
+#include "config_align.h"
+#include "config_asm.h"
+#include "config_cpu.h"
+#include "config_cxx.h"
+#include "config_dll.h"
+#include "config_int.h"
+#include "config_misc.h"
+#include "config_ns.h"
+#include "config_os.h"
+#include "config_ver.h"
+
+#endif // CRYPTOPP_CONFIG_H