Port the ActorInstance*/InstanceBase* siblings plus GameUtil, FlyTarget,
PhysicsObject, GameEventManager, WeaponTrace, MapUtil and lineintersect_utils
verbatim and drop their pending stand-ins; CGameEventManager and CPythonSystem
join PythonBoot in CPythonApplication member order.
Root cause of the intermittent Loading-phase header 7: TPlayerSkill::tNextRead
is time_t, 32-bit in 40250 (_USE_32BIT_TIME_T) but 64-bit on LP64, so
SKILL_LEVEL (76) was read as 2551 bytes instead of 1531. Packet.h now uses
LONG with a static_assert, and the fake server sends SKILL_LEVEL in Loading.
The fake server's CHARACTER_ADD now uses CHAR_TYPE_PC; port.login_flow
asserts the main instance exists with race 0.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
