Soft-deprecate SE versions of aes()

Author: lionel-

NEWS.md

@@ -2,11 +2,9 @@
 
 ## New features
 
-* `aes()` now supports quasiquotation so that you can use `!!`, `!!!`, and
-  `:=`. (ggplot2 does not currently support full tidy evaluation because
-  when I wrote ggplot2 my understanding of NSE was quite flawed, and hence
-  ggplot2 only captures one environment per plot, not one environment
-  per aesthetic. We will fix this in a future release.)
+* `aes()` now supports quasiquotation so that you can use `!!`, `!!!`,
+  and `:=`. This replaces `aes_()` and `aes_string()` which are now
+  soft-deprecated (but will remain around for a long time).
 
 * ggplot2 now works on R 3.1 onwards, and uses the 
   [vdiffr](https://github.com/lionel-/vdiffr) package for visual testing.

R/aes.r

@@ -198,6 +198,13 @@ is_position_aes <- function(vars) {
 #' `aes(colour = "my colour")` or \code{aes{x = `X$1`}}
 #' with `aes_string()` is quite clunky.
 #'
+#'
+#' @section Life cycle:
+#'
+#' All these functions are soft-deprecated. Please use tidy evaluation
+#' idioms instead (see the quasiquotation section in
+#' [aes()] documentation).
+#'
 #' @param x,y,... List of name value pairs. Elements must be either
 #'   quoted calls, strings, one-sided formulas or constants.
 #' @seealso [aes()]