tests: avoid hard-coded CRLFs in more sections

- `reply/data*`, `verify/stdout`, `verify/stderr`, `verify/file*`,
  `verify/proxy`:
  - make `crlf="yes"` force CRLF to all lines, instead of just applying
    to HTTP protocol headers.
  - add support for `crlf="headers"` that only converts HTTP protocol
    header lines to CRLF. (previously done via `crlf="yes"`.)
  - use `crlf="headers"` where possible.

- `reply/connect*`:
  - add support for `crlf="yes"` and `crlf="headers"`.
  - use them where possible.

- `client/file*`, `client/stdin`:
  - add support for `crlf="yes"`.
  - use it where possible.

- `reply/data*`, `verify/protocol`:
  - replace existing uses of `crlf="yes"` with `crlf="headers`" where it
    does not change the result.

Reducing the number of `tests/data/test*`:
- CRLF newlines from 10295 to 1985. (119985 lines total)
- files with mixed newlines from 656 to 113. (1890 files total)

After this patch there remain 141 sections with mixed newlines, where
the mixing is not split between headers/non-headers. There is no obvious
pattern here. Some of the CRLF uses might be accidental, or
non-significant. They will be tackled in a future patch.

Follow-up to 6cf3d7b1b1 #19318
Follow-up to 4d2a05d3fe #19284

Closes #19313

tests/data/test580

@@ -10,23 +10,23 @@ Duplicate-header
 
 # Server-side
 <reply>
-<data>
-HTTP/1.1 302 eat this!
-Date: Tue, 09 Nov 2010 14:49:00 GMT
-Server: test-server/fake
-Location: this-is-the-first.html
-Content-Length: 0
-Connection: close
-Location: and there's a second one too! / moo.html
-
+<data crlf="headers">
+HTTP/1.1 302 eat this!
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Location: this-is-the-first.html
+Content-Length: 0
+Connection: close
+Location: and there's a second one too! / moo.html
+
 </data>
-<datacheck>
-HTTP/1.1 302 eat this!
-Date: Tue, 09 Nov 2010 14:49:00 GMT
-Server: test-server/fake
-Location: this-is-the-first.html
-Content-Length: 0
-Connection: close
+<datacheck crlf="headers">
+HTTP/1.1 302 eat this!
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Location: this-is-the-first.html
+Content-Length: 0
+Connection: close
 </datacheck>
 </reply>
 
@@ -53,7 +53,7 @@ http://%HOSTIP:%HTTPPORT/%TESTNUMBER
 
 # Verify data after the test has been "shot"
 <verify>
-<protocol crlf="yes">
+<protocol crlf="headers">
 GET /%TESTNUMBER HTTP/1.1
 Host: %HOSTIP:%HTTPPORT
 Accept: */*