Resolves these errors:
```
 ------ -------------------------------------------------
  Line   app/Www/Presenters/ErrorPresenter.php
 ------ -------------------------------------------------
  76     Cannot call method getParameter() on mixed.
  76     Cannot call method getPresenterName() on mixed.
  91     Cannot call method getParameters() on mixed.
 ------ -------------------------------------------------
```

Resolves these errors:
```
 ------ -------------------------------------------
  Line   app/Www/Presenters/BaseErrorPresenter.php
 ------ -------------------------------------------
  58     Cannot call method getCode() on mixed.
  58     Cannot call method getFile() on mixed.
  58     Cannot call method getLine() on mixed.
  58     Cannot call method getMessage() on mixed.
 ------ -------------------------------------------
```

…st what's needed at the moment

Resolves these errors:
```
 ------ ------------------------------------------------------------------------------------------------------------------
  Line   app/Tls/CertificateFactory.php
 ------ ------------------------------------------------------------------------------------------------------------------
  50     Cannot access offset 'commonName' on mixed.
  50     Parameter #1 $commonName of class MichalSpacekCz\Tls\Certificate constructor expects string, mixed given.
  52     Cannot cast mixed to string.
  53     Cannot cast mixed to string.
  55     Parameter #6 $serialNumber of class MichalSpacekCz\Tls\Certificate constructor expects string|null, mixed given.
 ------ ------------------------------------------------------------------------------------------------------------------
```

…ette\Schema

Resolves
```
 ------ ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  Line   app/Tls/CertificatesApiClient.php
 ------ ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  69     Parameter #1 $details of method MichalSpacekCz\Tls\CertificateFactory::fromArray() expects array{commonName: string, commonNameExt: string|null, notBefore: string, notBeforeTz: string, notAfter: string, notAfterTz: string, expiringThreshold:
         int, serialNumber: string|null, ...}, mixed given.
 ------ ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

```

This was easy, removes this:
```
 ------ ------------------------------------------------------------------------------------------------
  Line   app/Test/NoOpTranslator.php
 ------ ------------------------------------------------------------------------------------------------
  36     Method MichalSpacekCz\Test\NoOpTranslator::translate() should return string but returns mixed.
 ------ ------------------------------------------------------------------------------------------------
```

This is sort of a duplication of what's already defined in the schema but here we are. Solves these:
```
 ------ ----------------------------------------------------
  Line   app/Pulse/Passwords/AlgorithmAttributesFactory.php
 ------ ----------------------------------------------------
  37     Cannot access property $inner on mixed.
  37     Cannot access property $outer on mixed.
  37     Cannot access property $params on mixed.
 ------ ----------------------------------------------------
```

…the future

Right now, `Nette\Http\Request::getCookie()` returns mixed and would require we check for strings all the time

Currently, `$form->onValidate` and `$form->onSuccess` types for `$values` are specified as `mixed` and the type in the callbacks cannot be narrower as seen in errors like:

```
 ------ -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  Line   app/Form/TrainingApplicationAdminFormFactory.php
 ------ -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  96     Property Nette\Forms\Form::$onSuccess (array<callable(Nette\Application\UI\Form, mixed): void>) does not accept non-empty-array<(callable(Nette\Application\UI\Form, mixed): void)|(Closure(Nette\Application\UI\Form, stdClass): void)>.
         💡 Type stdClass of parameter #2 $values of passed callable needs to be same or wider than parameter type mixed of accepting callable.
 ------ -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
```

Resolves:
```
 ------ -----------------------------------------------------------------------
  Line   app/UpcKeys/Technicolor.php
 ------ -----------------------------------------------------------------------
  88     Parameter #2 $string of function explode expects string, mixed given.
 ------ -----------------------------------------------------------------------
```

… is an int

This is kinda unrelated but I still like it.

Fix
```
 ------ ---------------------------------------------------------------
  Line   app/Test/Application/ApplicationPresenter.php
 ------ ---------------------------------------------------------------
  38     Parameter #2 $ of closure expects array<string>, array given.
 ------ ---------------------------------------------------------------
```

Fixes these errors:
```
 ------ --------------------------------------------------------------------------------------------
  Line   app/Training/Dates/TrainingDatesFormValidator.php
 ------ --------------------------------------------------------------------------------------------
  18     Parameter #1 $datetime of class DateTimeImmutable constructor expects string, mixed given.
  19     Parameter #1 $datetime of class DateTimeImmutable constructor expects string, mixed given.
 ------ --------------------------------------------------------------------------------------------
```

It was either PhpStorm complaining that the right part of `$slideNumber ?? ...` is useless, or PHPStan complaining that "Cannot access property $number on mixed." Or both.

Don't care if not because it's gonna be a string, trust me.