Define the Frame type

Frame type should be camera specific and specialized with:

• The pixel types supported the camera (already the case)
• Some camera specific metadata (fpga_frame_idx, bunch_id) from the SDK

I suggest to start with something like:

template< typename Pixel, typename Metadata, bool IsPlanar = false, typename Alloc=std::allocator<unsigned char> >
class frame :
    public image<Pixel, IsPlanar, Alloc>
{
...
}

frame is derived from boost::gil::image.

Alloc is in charge of doing the proper memory management.

Metadata is the customization point for plugin metadata.