make strformat part of the prelude (#18046)

changelog.md

@@ -73,6 +73,9 @@
 - `json` and `jsonutils` now serialize NaN, Inf, -Inf as strings, so that
   `%[NaN, -Inf]` is the string `["nan","-inf"]` instead of `[nan,-inf]` which was invalid json.
 
+- `strformat` is now part of `include std/prelude`.
+
+
 ## Standard library additions and changes
 - Added support for parenthesized expressions in `strformat`
 

lib/pure/prelude.nim

@@ -25,4 +25,4 @@ when defined(nimdoc) and isMainModule:
   # xxx `nim doc -b:js -d:nodejs --doccmd:-d:nodejs lib/pure/prelude.nim` fails for some reason
   # specific to `nim doc`, but the code otherwise works with nodejs.
 
-import std/[os, strutils, times, parseutils, hashes, tables, sets, sequtils, parseopt]
+import std/[os, strutils, times, parseutils, hashes, tables, sets, sequtils, parseopt, strformat]