get_analogue: return resulted strings of approximate string match
In ggconf: Simpler Appearance Modification of 'ggplot2'

return resulted strings of approximate string match

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get_analogue(fuzzy_input = "axs.txt", possibilities = c("axis.text",
  "axis.text.x"), n_top = 5, case_sensitive = FALSE, cost = c(insertions =
  0.25, deletions = 3, substitutions = 2), threshold = 6, debug = FALSE)

`fuzzy_input`	A character. Typically user input.
`possibilities`	A character vector one of which is assumed to be pointed by fuzzy_input.
`n_top`	An integer specifying the number of returned strings.
`case_sensitive`	Default is FALSE.
`cost`	A named vector
`threshold`	If costs are more than threshold, remove them from the result even if they are within top `n_top`. Default is 6.
`debug`	If true, it shows costs for top candidates. `get_analogue` is a key function for returning useful compile error message.

get_analogue("axis.txt", c("axis.text", "axis.text.x", "axis.ticks"))
# returns "axis.text" "axis.text.x" "axis.ticks"

get_analogue("p.bg", c("plot.background", "panel.background"))
# returns "plot.background" as first, and then "panel.background"