noproxy: patterns need to be comma separated

or they will not parse correctly.

Mentioned in DEPRECATED since Janurary 2023 (in 7ad8a7ba9ebdedc).

Closes #13789

build: untangle `UNITTESTS` and `DEBUGBUILD` macros

- fix `DEBUGBUILD` guards that should be `UNITTESTS`, in libcurl code
used by unit tests.
- fix guards for libcurl functions use

build: untangle `UNITTESTS` and `DEBUGBUILD` macros

- fix `DEBUGBUILD` guards that should be `UNITTESTS`, in libcurl code
used by unit tests.
- fix guards for libcurl functions used in unit tests only.
- sync `UNITTEST` attribute between declarations and definitions.
- drop `DEBUGBUILD` guard from test `unit2600`.
- fix guards for libcurl HSTS code used by both a unit test (`unit1660`)
and `test0446`.
- update an existing AppVeyor CI job to test the issues fixed.

This fixes building tests with `CURLDEBUG` enabled but `DEBUGBUILD`
disabled. This can happen when building tests with CMake with
`ENABLE_DEBUG=ON` in Release config, or with `ENABLE_CURLDEBUG=ON`
and _without_ `ENABLE_DEBUG=ON`. Possibly also with autotools
when using `--enable-curldebug` without `--enable-debug`.

Test results:
- before:
https://ci.appveyor.com/project/curlorg/curl/builds/49835609
https://ci.appveyor.com/project/curlorg/curl/builds/49898529/job/k8qpbs8idby70smw
https://github.com/curl/curl/actions/runs/9259078835/job/25470318167?pr=13798#step:13:821
- after: https://ci.appveyor.com/project/curlorg/curl/builds/49839255
(the two failures are unrelated, subject to PR #13705)

Ref: #13592 (issue discovery)
Ref: #13689 (CI testing this PR with `DEBUGBUILD`/`CURLDEBUG` combinations)
Closes #13694

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noproxy: support for space-separated names is deprecated

To be removed in July 2024.

Assisted-by: Michael Osipov
Fixes #10209
Closes #10215

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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noproxy: support proxies specified using cidr notation

For both IPv4 and IPv6 addresses. Now also checks IPv6 addresses "correctly"
and not with string comparisons.

Split out th

noproxy: support proxies specified using cidr notation

For both IPv4 and IPv6 addresses. Now also checks IPv6 addresses "correctly"
and not with string comparisons.

Split out the noproxy checks and functionality into noproxy.c

Added unit test 1614 to verify checking functions.

Reported-by: Mathieu Carbonneaux

Fixes #9773
Fixes #5745
Closes #9775

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