Allow alternative methods other than stats::density()?

[Aariq]

ggridges/R/stats.R

Lines 177 to 182 in a8a9982

	d <- stats::density(
	data$x,
	weights = weights,
	bw = bandwidth[panel_id], from = from[panel_id], to = to[panel_id], na.rm = TRUE,
	n = n
	)

stats::density() runs out of memory with very large datasets, but functions in the KernSmooth package seem like a good alternative—they are fast, accurate, and work with very large datasets. See more here: https://vita.had.co.nz/papers/density-estimation.pdf