spacecheck.pl: drop more exceptions

- replace ß (scharfes S) with links.
- replace § (section sign) with links.
- replace 🙏 emoji with `🙏`.
 Supported by GitHub, Forgejo/Gitea and most likely GitLab.
- docs/libcurl/curl_mprintf.md: replace Unicode ± with `{+|-}`.
- docs/CIPHERS.md: URL encode Unicode in URLs.
- lib1560: use hex encoding in `räksmörgås.se`.
- unit1307: use hex encoding in `Lindmätarv`.
- drop LATIN SMALL LETTER A WITH ACUTE exception.
  No longer appears in tests.

This leaves the single character exception: `ö`
And file exceptions holding contributor names.

Follow-up to 9243ed59b3 #17329
Follow-up to 838dc53bb7 #17247

Closes #17335

tests/unit/unit1307.c

@@ -243,7 +243,8 @@ static const struct testcase tests[] = {
   { "?*?*?.?",                  "abcdef.c",               MATCH },
   { "?*?*?.?",                  "abcdef.cd",              NOMATCH },
 
-  { "Lindmätarv",               "Lindmätarv",             MATCH },
+  /* https://codepoints.net/U+00E4 Latin Small Letter A with Diaeresis */
+  { "Lindm\xc3\xa4tarv",        "Lindm\xc3\xa4tarv",      MATCH },
 
   { "",                         "",                       MATCH},
   {"**]*[*[\x13]**[*\x13)]*]*[**[*\x13~r-]*]**[.*]*[\xe3\xe3\xe3\xe3\xe3\xe3"