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

.github/scripts/spacecheck.pl

@@ -48,14 +48,7 @@ my @space_at_eol = (
 );
 
 my @non_ascii_allowed = (
-    '\xC3\xA1',          # UTF-8 for https://codepoints.net/U+00E1 LATIN SMALL LETTER A WITH ACUTE
-    '\xC3\xA5',          # UTF-8 for https://codepoints.net/U+00E5 LATIN SMALL LETTER A WITH RING ABOVE
-    '\xC3\xA4',          # UTF-8 for https://codepoints.net/U+00E4 LATIN SMALL LETTER A WITH DIAERESIS
-    '\xC3\xB6',          # UTF-8 for https://codepoints.net/U+00F6 LATIN SMALL LETTER O WITH DIAERESIS
-    '\xC2\xB1',          # UTF-8 for https://codepoints.net/U+00B1 PLUS-MINUS SIGN
-    '\xC2\xA7',          # UTF-8 for https://codepoints.net/U+00A7 SECTION SIGN
-    '\xC3\x9F',          # UTF-8 for https://codepoints.net/U+00DF LATIN SMALL LETTER SHARP S
-    '\xF0\x9F\x99\x8F',  # UTF-8 for https://codepoints.net/U+1f64f PERSON WITH FOLDED HANDS
+    '\xC3\xB6',  # UTF-8 for https://codepoints.net/U+00F6 LATIN SMALL LETTER O WITH DIAERESIS
 );
 
 my $non_ascii_allowed = join(', ', @non_ascii_allowed);
@@ -65,7 +58,6 @@ my @non_ascii = (
     ".mailmap",
     "RELEASE-NOTES",
     "docs/BINDINGS.md",
-    "docs/CIPHERS.md",
     "docs/THANKS",
     "docs/THANKS-filter",
 );