.github, config, json, nimble: bump Nim from 1.6.12 to 2.0.0

[ee7]

See the release blog posts rc1 and rc2 and 2.0, detailed changelog, and changes since 1.6.12.

config.nims changes:

• Remove strictEffects, which Nim 2.0 enables by default.
• Disable noisy ProveInit and Uninit warnings for now.
• Enable strictDefs unconditionally. It was previously conditional to support older versions of Nim that lacked strictDefs.

Update patched stdlib json and parsejson.

In the tests, reflect a Nim 2.0 change to imports. From the changes affecting backward compatibility:

Relative imports will not resolve to searched paths anymore, e.g. import ./tables now reports an error properly.

---

To-do:

• Wait for Nim 2.0 release
• Resolve nimble test errors, e.g.:
  tests/all_tests.nim(2, 11) Error: cannot open file: ./helpers
• Windows: resolve uuids error (due to nim-lang/Nim@612abda):
  C:\Users\runneradmin\.nimble\pkgs2\uuids-0.1.11-393f5fcefbc8ad3cf167e59760144208ff8f9f76\uuids\urandom.nim(15, 8) Error: undeclared identifier: 'useWinUnicode'
  I've created pragmagic/uuids#9, but that may not be sufficient, and long-term I'd like to do uuid: use best practices for UUID generation #424 instead
• Update patched json.nim and parsejson.nim
• Windows: resolve patching error:

C:\Users\runneradmin\nimcache\all_tests_d\all_tests_EC059F07D9BFDE95FE3FAA825662EFD80E11A567.exe [SuccessX]
Hint: C:\Users\runneradmin\nimcache\all_tests_d\all_tests_EC059F07D9BFDE95FE3FAA825662EFD80E11A567.exe [Exec]
Running `nimble --verbose build -d:release`... failure
     Info:  Nimble data file "C:\Users\runneradmin\.nimble\nimbledata2.json" has been loaded.
  Verifying dependencies for configlet@4.0.0
    Reading official package list
   Checking for cligen@#b962cf8bc0be847cbc1b4f77952775de765e9689
     Info:  Dependency on cligen@#b962cf8bc0be847cbc1b4f77952775de765e9689 already satisfied
  Verifying dependencies for cligen@1.5.19
    Reading official package list
   Checking for jsony@#2a2cc4331720b7695c8b66529dbfea6952727e7b
     Info:  Dependency on jsony@#2a2cc4331720b7695c8b66529dbfea6952727e7b already satisfied
  Verifying dependencies for jsony@1.1.3
    Reading official package list
   Checking for parsetoml@#6e5e16179fa2db60f2f37d8b1af4128aaa9c8aaf
     Info:  Dependency on parsetoml@#6e5e16179fa2db60f2f37d8b1af4128aaa9c8aaf already satisfied
  Verifying dependencies for parsetoml@0.7.1
    Reading official package list
   Checking for supersnappy@#e4df8cb5468dd96fc5a4764028e20c8a3942f16a
     Info:  Dependency on supersnappy@#e4df8cb5468dd96fc5a4764028e20c8a3942f16a already satisfied
  Verifying dependencies for supersnappy@2.1.3
 Attempting to execute hook buildBefore in D:\a\configlet\configlet\configlet.nimble
Checking patch cligen/parseopt3.nim...
error: while searching for:
    p.kind = cmdError?
    return?
  if p.pos < p.cmd.len:                 # Take opt arg from next param?
    p.val = p.cmd[p.pos]?
    p.pos += 1?
  elif p.longNoVal.len != 0:?
    p.val = ""?
    p.pos += 1?

error: patch failed: cligen/parseopt3.nim:267
error: cligen/parseopt3.nim: patch does not apply
stack trace: (most recent call last)
C:\Users\RUNNER~1\AppData\Local\Temp\nimblecache-0\nimscriptapi_3135216885.nim(222, 29)
D:\a\configlet\configlet\configlet.nimble(31, 37) buildBefore
D:\a\configlet\configlet\patches\patch.nim(61, 3) ensureThatNimblePackagesArePatched
D:\a\configlet\configlet\patches\patch.nim(53, 8) patchCligen
D:\a\configlet\configlet\patches\patch.nim(46, 25) patch
D:\a\configlet\configlet\patches\patch.nim(12, 5) gorgeCheck
D:\a\configlet\configlet\patches\patch.nim(12, 5) Error: unhandled exception: failed to apply patch [OSError]
nimscriptwrapper.nim(160) execScript

    Error:  Exception raised during nimble script execution
     Info:  Nimble data file "C:\Users\runneradmin\.nimble\nimbledata2.json" has been saved.

D:\a\configlet\configlet\tests\test_binary.nim([1165](https://github.com/exercism/configlet/actions/runs/5785968697/job/15679844551#step:6:1166)) test_binary
D:\a\configlet\configlet\tests\test_binary.nim(1026) main
D:\a\configlet\configlet\src\exec.nim(68) execAndCheck
Error: unhandled exception:  [OSError]
Error: execution of an external program failed: 'C:\Users\runneradmin\nimcache\all_tests_d\all_tests_EC059F07D9BFDE95FE3FAA825662EFD80E11A567.exe'
stack trace: (most recent call last)
C:\Users\RUNNER~1\AppData\Local\Temp\nimblecache-0\nimscriptapi_3135216885.nim(210, 16)
D:\a\configlet\configlet\configlet.nimble(28, 3) testTask
D:\a\configlet\configlet\nimdir\lib\system\nimscript.nim(265, 7) exec
D:\a\configlet\configlet\nimdir\lib\system\nimscript.nim(265, 7) Error: unhandled exception: FAILED: nim r ./tests/all_tests.nim [OSError]
       Tip: 9 messages have been suppressed, use --verbose to show them.
nimscriptwrapper.nim(160) execScript

[ee7]

I have no idea why this would cause the parseopt3 patching to fail on Windows.

Edit: maybe something in nim-lang/Nim@f7c203f#diff-8f98e7617bc9dd47ac179ddec678781d48d70e7f7b9f37f76298ef643f82c690

Edit2: maybe the hash function now differs between Linux and Windows?