Added some functions

TESQuest * BGSScene::GetOwningQuest(void)
bool BGSScene::IsPlaying(void) const
void BGSScene::ForceStart(void)
void BGSScene::Start(void)
void BGSScene::Stop(void)
bool BGSLocation::IsLoaded(void) const
bool BGSLocation::IsCleard(void) const
bool BGSLocation::IsChild(BGSLocation*)
TESNPC * TESObjectCELL::GetActorOwner(void)
bool TESObjectCELL::IsInterior(void) const
BGSLocation * TESObjectREFR::GetCurrentLocation(void)
TESObjectCELL * GetParentCell(void)
Corrected virtual functions