Make clipping configurable in coord_sf().

[clauswilke]

This PR closes #2938.

Example:

library(ggplot2)

nc <- sf::st_read(system.file("shape/nc.shp", package = "sf"), quiet = TRUE)
p <- ggplot(nc) +
  geom_sf(aes(fill = AREA)) +
  geom_text(x = -80, y = 37, label = "label outside limits", inherit.aes = FALSE)

p

p + coord_sf(clip = "off")

^{Created on 2018-10-15 by the reprex package (v0.2.1)}

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