// DoesContextExistForThisPed
BOOL DOES_CONTEXT_EXIST_FOR_THIS_PED(Ped ped, char* speechName, BOOL allowBackupPVGs);
Returns: True of the PedVoiceGroup exists, false otherwise.
Checks if the context exists for the ped, searching through the voices in its PedVoiceGroup.
The final argument can be set to true to allow searching in backup PVGs