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/Lib/user.py

@@ -0,0 +1,48 @@
+"""Hook to allow user-specified customization code to run.
+
+As a policy, Python doesn't run user-specified code on startup of
+Python programs (interactive sessions execute the script specified in
+the PYTHONSTARTUP environment variable if it exists).
+
+However, some programs or sites may find it convenient to allow users
+to have a standard customization file, which gets run when a program
+requests it.  This module implements such a mechanism.  A program
+that wishes to use the mechanism must execute the statement
+
+    import user
+
+The user module looks for a file .pythonrc.py in the user's home
+directory and if it can be opened, execfile()s it in its own global
+namespace.  Errors during this phase are not caught; that's up to the
+program that imports the user module, if it wishes.
+
+The user's .pythonrc.py could conceivably test for sys.version if it
+wishes to do different things depending on the Python version.
+
+"""
+from warnings import warnpy3k
+warnpy3k("the user module has been removed in Python 3.0", stacklevel=2)
+del warnpy3k
+
+import os
+
+home = os.curdir                        # Default
+if 'HOME' in os.environ:
+    home = os.environ['HOME']
+elif os.name == 'posix':
+    home = os.path.expanduser("~/")
+elif os.name == 'nt':                   # Contributed by Jeff Bauer
+    if 'HOMEPATH' in os.environ:
+        if 'HOMEDRIVE' in os.environ:
+            home = os.environ['HOMEDRIVE'] + os.environ['HOMEPATH']
+        else:
+            home = os.environ['HOMEPATH']
+
+pythonrc = os.path.join(home, ".pythonrc.py")
+try:
+    f = open(pythonrc)
+except IOError:
+    pass
+else:
+    f.close()
+    execfile(pythonrc)