Replace FatalThrowableError with FatalError

[netdown]

Debug component was deprecated and replaced by ErrorHandler in Symfony 4.4. Laravel 7 uses a Symfony 5 which does not contain Debug anymore, therefore app crashes.
ErrorHandler does not have a similar class, therefore I extracted a little bit of logic from the old FatalThrowableError to construct a FatalError object.
Fixes #406

EDIT: using getCode() on exception may be a better choice, however, it would behave differently than the old class.

[coveralls]

Coverage decreased (-0.5%) to 68.128% when pulling e9de2aa on netdown:master into 2271aa7 on swooletw:master.

[paschaldev]

Need this

[netdown]

@albertcht Would you be able to merge some of the pull requests and make a release?

[serdarozturk]

Maybe we should check the class existence for coverage issue.

if (class_exists(FatalThrowableError::class)) { $e = new FatalThrowableError($e); } else { if ($e instanceof \ParseError) { $severity = E_PARSE; } elseif ($e instanceof \TypeError) { $severity = E_RECOVERABLE_ERROR; } else { $severity = E_ERROR; } $error = [ 'type' => $severity, 'message' => $e->getMessage(), 'file' => $e->getFile(), 'line' => $e->getLine(), ]; $e = new FatalError($e->getMessage(), $e->getCode(), $error, null, true, $e->getTrace()); }

[Arkanius]

@serdarozturk you say it in order to keep compatibility with older versions?

[ValeraBot]

Why it is not in master?

[lagerroos]

@albertcht Has this been removed from master and if so, why would that be?