port 2V2-d.2: Granny runtime on libgr2, main character model animates

Implement the Granny SDK 2.11 API the client uses on top of libgr2
(platform/EterGrnLib/GrannyRuntime.cpp, shim granny.h declared from the
SDK header): file sections, type-definition vertex conversion, material
textures by Usage, mesh/bone bindings, deformer, control clock/loop/ease
and weighted SRT sampling. Port EterGrnLib (LODController, Material, Mesh,
Model, ModelInstance*, Motion, Thing, ThingInstance, Util) plus EterLib
GrpObjectInstance/GrpCollisionObject/CollisionData verbatim and drop their
platform skeletons and pending stand-ins; register the gr2 resource
factory; vertex/index buffers are CPU-side until the 2V2-e render adapter.

app.UpdateGame/RenderGame now run 40250's bodies, reaching the
CPythonApplication members through their singletons (the platform has no
app object); CPythonGraphic joins GameSingletons in member order, and
GetMousePosition reads the host cursor.

port.login_flow asserts the main instance's PART_MAIN model has meshes,
its diffuse image loaded and the WAIT motion moves the bones between
frames; offline and live pass, port_gate macos PASS.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

extension/src/platform/EterPythonLib/PythonGraphic.cpp

@@ -12,6 +12,22 @@
 #include "../PlatformStub.h"
 #include "../EterLib/UIRenderCommands.h"
 
+// 40250 PythonGraphic.cpp:611
+CPythonGraphic::CPythonGraphic()
+{
+	m_lightColor = GetColor(1.0f, 1.0f, 1.0f);
+	m_darkColor = GetColor(0.0f, 0.0f, 0.0f);
+
+	memset(&m_backupViewport, 0, sizeof(D3DVIEWPORT8));
+
+	m_fOrthoDepth = 1000.0f;
+}
+
+CPythonGraphic::~CPythonGraphic()
+{
+	Tracef("Python Graphic Clear\n");
+}
+
 void CPythonGraphic::SetViewport(float x, float y, float width, float height) { UIRenderSetClip(x, y, width, height); }
 void CPythonGraphic::RestoreViewport() { UIRenderRestoreClip(); }
 void CPythonGraphic::SetOmniLight() { MT_PLATFORM_STUB(); }