Adds `width`

space between the columns or `height`

space between
the rows.

gtable_add_col_space(x, width)
gtable_add_row_space(x, height)

## Arguments

x |
a gtable object |

width |
a vector of units of length 1 or ncol - 1 |

height |
a vector of units of length 1 or nrow - 1 |