ClassAndPackageLoader - built packages fail to load

[glady]

When I build a package file with classes that contain a declare(strict_types=1); the resulting php is invalid.

Full list of issues:

• declare(strict_types=1);
• use statements conflict in namings

[glady]

I think there are different issues, currently also some <?php land in between of the classes too and use statements conflict in my current project too.