Preserve laravel error handler

[erikn69]

Based on php-debugbar/php-debugbar#748

Wouldn't this conflict with the existing error handler?
php-debugbar/php-debugbar#748 (comment)

We are currently replacing the Laravel error handler,
this removes some functionality, such as deprecation control, look at: laravel/framework/Illuminate/Foundation/Bootstrap/HandleExceptions.php#L69-L76

The throw is returned to the framework and only the data is captured

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If php-debugbar/php-debugbar#748 get merged, we could go from this

laravel-debugbar/src/LaravelDebugbar.php

Line 653 in 008dfe9

$this->addThrowable($exception);

to this

$this->addWarning($level, $message, $file, $line);

which would considerably reduce the size of the collect in case of many notices/deprecations