Perspective-n-Point pose estimation

// classes

class mrpt::vision::pnp::CPnP;
class POSIT;
class mrpt::vision::pnp::dls;
class mrpt::vision::pnp::epnp;
class mrpt::vision::pnp::lhm;
class mrpt::vision::pnp::p3p;
class mrpt::vision::pnp::posit;
class mrpt::vision::pnp::ppnp;
class mrpt::vision::pnp::rpnp;
class mrpt::vision::pnp::upnp;