(rename|select)_(at|if|all) functions should adapt grouping if necessary

[krlmlr]

#3363 (comment), CC @lionel-:

Current behavior:

library(tidyverse)
tibble(a = 1, b = 2) %>% group_by(a) %>% rename_all(toupper)
#> # A tibble: 1 x 2
#> # Groups:   a [1]
#>       a     B
#>   <dbl> <dbl>
#> 1    1.    2.

Created on 2018-03-12 by the reprex package (v0.2.0).

Desired: Column a is renamed to A, the grouping is adapted.

We may want to implement this for the 0.7.5 release.

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