EMI: Check extension for Lua_V2::LoadSound
EMI: UnloadActor: Free actor after removing it

Fixes Coverity issue #1009869
EMI: Implement Lua_V2::GetCameraPos
EMI: Handle missing bones gracefully
GRIM: Fix Valgrind warning in start_script et al
EMI: Stub for EnableActorPuck
EMI: Guess at lipsync 0x0000 to silence warnings
EMI: Encapsulate PoolSound track
temp commit 2