Closes GH-5758

getrusage supports only two fields. The network api sits in the network lib.

Closes GH-5732.

Closes GH-5676.

We fix (hopefully) all instances of:

* <https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4005>
* <https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4024>
* <https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4028>
* <https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4047>
* <https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4087>
* <https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4090>
* <https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4273>
* <https://docs.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-1-c4312>

`zend_llist_add_element()` and `zend_llist_prepend_element()` now
explicitly expect a *const* pointer.

We use the macro `ZEND_VOIDP()` instead of a `(void*)` cast to suppress
C4090; this should prevent accidential removal of the cast by
clarifying the intention, and makes it easier to remove the casts if
the issue[1] will be resolved sometime.

[1] <https://developercommunity.visualstudio.com/content/problem/390711/c-compiler-incorrect-propagation-of-const-qualifie.html>

* PHP-7.4:
  Enable phpdbg tests on AppVeyor
  Make phpdbg test portable
  Fix several mostly Windows related phpdbg bugs
  Fix #73926: phpdbg will not accept input on restart execution

* Properly initialize PHPDBG_G(watch_tmp)

  Otherwise that may cause segfaults in ZTS builds.

* Deactivate potentially remaining watchpoints after REPL

  Otherwise the memory could still be protected, resulting in segfaults
  during shutdown.

* NULL zend_handlers_table after freeing

  As of commit 4130fe4[1], the `zend_handlers_table` is explicitly
  freed in the `zend_vm_dtor()`.  Since phpdbg (and maybe some other
  SAPIs) may restart the engine afterwards, we have to make sure that
  the table is also NULLed.

* Only set context option if there is a context

  In other words, we must not follow the null pointer.

* Cater to file handles without attached console

  File handles do not necessarily have an attached console (for
  instance, pipes do not), in which case `GetConsoleScreenBufferInfo()`
  fails.  In this case we set a default value (`40`) for lines like on
  other systems.

[1] <http://git.php.net/?p=php-src.git;a=commit;h=4130fe437a5db7ead1444d3748bd0fbad9829cb2>

* PHP-7.4:
  Fix INI setting member name

* PHP-7.3:
  Fix INI setting member name

Since the member is not used in `OnUpdateEol()` that's not really an
issue, but still it's confusing to apparently have two INI settings
targeting the same member.