add a plot as vector graphics into layout placeholder

phl_with_vg(x, olay, id, code, ggobj = NULL, ...)

Arguments

x	rpptx object
olay	an OfficerLayout object created using `phl_layout`
id	an single integer with an id of the placeholder from `olay` object.
code	plot instructions.
ggobj	ggplot objet to print. Argument code will be ignored if this argument is supplied.
...	other arguments passed to `dml_pptx`