always returns string

Automatically regenerate the files (#651)

fix readme badge

More consistent formatting for generated files

`finfo`, despite being lowercase, is a class

grepping for "all the return typehints in `generated/`", it appears that this and `stdClass` are the only lowercase classes:

```
sl grep '^function' | cut -d: -f3 | sort | uniq
```

add return statements to functionsList.php

detect preg_replace_callback and preg_replace_callback_array, fixes #223

[generator] Remove redundant phpstan overrides

These overrides were added to manually replace `resource` with `CurlHandle` -- but we now automatically prefer objects over resources

Generate files for multiple versions

tl;dr:

replace

```php
$function_list = read_docs();
generate_files($function_list, "../generated/");
```

with

```php
foreach(["8.1", "8.2", "8.3", "8.4"] as $version) {
    exec("cd docs && git checkout $version");
    $function_list = read_docs();
    generate_files($function_list, "../generated/$version/");
}
```

generate a bunch of stubs like generated/misc.php:

```php
<?php
if(PHP_VERSION == "8.1") require_once __DIR__ . "/8.1/misc.php";
if(PHP_VERSION == "8.2") require_once __DIR__ . "/8.2/misc.php";
if(PHP_VERSION == "8.3") require_once __DIR__ . "/8.3/misc.php";
if(PHP_VERSION == "8.4") require_once __DIR__ . "/8.4/misc.php";
```

This also automates generation of "deprecated" `safe` functions (ie, instead of hard-coding `deprecated/apache.php`, any functions which needed safe wrappers in 8.1 but no longer need safe wrappers in 8.2 will have no-op stubs generated instead)

Currently the `Exceptions` are shared between all versions, which I _think_ is a good idea? (Thoughts, anybody?)

-

Merge pull request #409 from martinssipenko/fix-openssl_pkey_get_private

FIX: Fix openssl_pkey_get_* functions