Add replace-query action

replace-query action replaces the query string with the current
selection. If the selection is too long, it will be truncated.

If the line contains meta-characters of fzf search syntax, it is
possible that the line is no longer included in the updated result.

e.g.

  echo '!hello' | fzf --bind ctrl-v:replace-query

Close #1137

src/options.go

@@ -664,6 +664,8 @@ func parseKeymap(keymap map[int][]action, str string) {
 				appendAction(actAccept)
 			case "print-query":
 				appendAction(actPrintQuery)
+			case "replace-query":
+				appendAction(actReplaceQuery)
 			case "backward-char":
 				appendAction(actBackwardChar)
 			case "backward-delete-char":