port 2A step 4: platform skeleton + rest of the 2V3 header closure

- Mirror the remaining non-Python 2V3 closure headers (98 more, 173 total): EffectLib,
  EterGrnLib, SpeedTreeLib, SphereLib, PRTerrainLib, EterImageLib, EterBase/Poly, cipher/tea,
  EterLib Grp*/IME/Input/MSWindow/StateManager, GameLib actor/map/race headers, EterPack.
- SDK shims: granny.h, SpeedTreeRT.h, imm.h, Dimm.h (the SDK MIDL header, not mirrored),
  dinput/d3dx8 additions; D3D8 render-state enums, FVF macros and the COM resource hierarchy;
  more Win32 GDI/handle types with layout static_asserts.
- PORT edits for MSVC-permissive code (typename, friend visibility, <algorithm>, pointer→uintptr_t)
  and PRTerrainLib/StdAfx.h dropping the ScriptLib/Python include.
- port_logic links the vendored cryptopp/minilzo.
- extension/src/platform: port_platform target with 103 generated stub files (1917 function
  stubs, 146 static members) from the new platform_stub.py (clang -ast-dump-filter);
  MT_PLATFORM_STUB() marks every unimplemented body. libmtgodot links port_platform and
  port_gate.sh builds it.

Gate: macOS, Android, iOS, Windows (mingw) PASS; Linux BLOCKED (no toolchain).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

extension/src/port/EterBase/tea.h

@@ -0,0 +1,19 @@
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+    /* TEA is a 64-bit symmetric block cipher with a 128-bit key, developed
+       by David J. Wheeler and Roger M. Needham, and described in their
+       paper at <URL:http://www.cl.cam.ac.uk/ftp/users/djw3/tea.ps>.
+
+       This implementation is based on their code in
+       <URL:http://www.cl.cam.ac.uk/ftp/users/djw3/xtea.ps> */
+
+	#define TEA_KEY_LENGTH 16
+
+    int tea_encrypt(unsigned long *dest, const unsigned long *src, const unsigned long *key, int size);
+    int tea_decrypt(unsigned long *dest, const unsigned long *src, const unsigned long *key, int size);
+
+#ifdef __cplusplus
+};
+#endif