Get configuration of a light cone (LC)

This function returns a matrix of space-time coordinates of the field. Both for the whole field as well as the truncated field (without the margin)

1 | ```
get_spacetime_grid(dim, LC.coordinates)
``` |

`dim` |
dimension of the original field (first dimension is time; rest is space) |

`LC.coordinates` |
template of the LC coordinates |

`compute_LC_coordinates`

,
`setup_LC_geometry`

1 2 3 | ```
AA <- matrix(rnorm(200), ncol = 10)
LC.geom <- setup_LC_geometry(speed = 1, horizon = list(PLC = 3, FLC = 0), shape = "cone")
bb <- get_spacetime_grid(dim(AA), LC.geom$coordinates)
``` |

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