void
SetDefine
( const TCHAR* Name, const TCHAR* Value)
Works for TCHAR e.g. SetDefine(TEXT("NUM_SAMPLES"), TEXT("1"));
( const TCHAR* Name, const FString& Value)
( const TCHAR* Name, bool Value)
( const TCHAR* Name, uint32 Value)
( const TCHAR* Name, int32 Value)