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/cpython-2.7.18/Misc/BeOS-NOTES

@@ -0,0 +1,43 @@
+Python for BeOS R5
+
+In Python-2.1, the standard version of the new setup.py program
+will not build the full complement of modules on BeOS.  Instead,
+please replace it with the special BeOS version in Misc/BeOS-setup.py.
+
+To build,
+
+   1)  cp Misc/BeOS-setup.py setup.py
+   2)  ./configure --prefix=/boot/home/config
+   3)  make
+
+The modules will all build, except termios which assumes some flags
+we don't have.  Put a libreadline.a in /boot/home/config/lib to get
+a readline.so for your interactive editing convenience;  NB, not
+libreadline.so, you want to link a static readline library into the
+dynamically loaded Python module.
+
+Test:
+
+   make test
+
+   The BeOS is Not UNIX category:
+ - test_select crashed -- select.error : (-2147459072, 'Bad file descriptor')
+ - test_socket crashed -- exceptions.AttributeError : SOCK_RAW
+ - test_fcntl crashed -- exceptions.IOError: [Errno -2147483643] Invalid argument
+
+   This one is funny!  BeOS does support large files, and that's why
+       we get this error:  the file is too big for my filesystem!
+ - test_largefile crashed -- exceptions.IOError: [Errno -2147459065]
+       No space left on device
+
+ - test_pickle crashed.  This is apparently a serious problem, "complex"
+       number objects reconstructed from a pickle don't compare equal to
+       their ancestors.  But it happens on BeOS PPC only, not Intel.
+
+Install:
+
+   make install
+
+
+Maintainer: None (please volunteer if you would like to see this port continue
+to exist!)