port 2V2-c: chrmgr/chr modules + race registration chain

PythonCharacterManagerModule/PythonCharacterModule ported verbatim; the
2V0 chr/chrmgr stubs are gone and initchr/initchrmgr run in 40250 order.
The registration chain they need (RaceData/RaceDataFile/RaceManager/
RaceMotionData, GameType, AttributeData/AttributeInstance, TextFileLoader,
Util, Camera/CameraProcedure) is ported; CRaceManager is created in
PythonBoot. port.login_flow asserts race 0 has its wait motions and no
unhandled packet header; port.login_live 8/8 against 192.168.21.203.

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

extension/src/platform/EterLib/Camera.cpp

@@ -1,9 +0,0 @@
-#include "EterLib/StdAfx.h"
-#include "EterLib/Camera.h"
-#include "../PlatformStub.h"
-
-CCamera* CCameraManager::GetCurrentCamera()
-{
-	MT_PLATFORM_STUB();
-	return nullptr;
-}