Group source include

Source parts:

PVR_ERROR CMyInstance::GetChannelGroupsAmount(int& amount)
{
   return PVR_ERROR_NOT_IMPLEMENTED; 
}
 
PVR_ERROR CMyInstance::GetChannelGroups(bool radio, kodi::addon::PVRChannelGroupsResultSet& results)
{
  return PVR_ERROR_NOT_IMPLEMENTED;
}
 
PVR_ERROR CMyInstance::GetChannelGroupMembers(const kodi::addon::PVRChannelGroup& group, kodi::addon::PVRChannelGroupMembersResultSet& results)
{
  return PVR_ERROR_NOT_IMPLEMENTED;
}