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/README.Emacs

@@ -0,0 +1,32 @@
+=============
+Emacs support
+=============
+
+If you want to edit Python code in Emacs, you should download python-mode.el
+and install it somewhere on your load-path.  See the project page to download:
+
+    https://launchpad.net/python-mode
+
+While Emacs comes with a python.el file, it is not recommended.
+python-mode.el is maintained by core Python developers and is generally
+considered more Python programmer friendly.  For example, python-mode.el
+includes a killer feature called `pdbtrack` which allows you to set a pdb
+breakpoint in your code, run your program in an Emacs shell buffer, and do gud
+style debugging when the breakpoint is hit.
+
+python-mode.el is compatible with both GNU Emacs from the FSF, and XEmacs.
+
+For more information and bug reporting, see the above project page.  For help,
+development, or discussions, see the python-mode mailing list:
+
+    http://mail.python.org/mailman/listinfo/python-mode
+
+
+..
+   Local Variables:
+   mode: indented-text
+   indent-tabs-mode: nil
+   sentence-end-double-space: t
+   fill-column: 78
+   coding: utf-8
+   End: