Support for trait mapping files

[bigfoot90]

Solve #223

[greg0ire]

This introduces a violation of this method's signature:

persistence/lib/Doctrine/Persistence/Mapping/ReflectionService.php

Line 23 in 9f22673

* @psalm-return class-string[]

Also, it's inconsistent with its name.

[bigfoot90]

The schema tool is working rigth now with traits and xml mappings.

But the UnitOfWork is not, I need a help here.

I'm getting this error:
[ReflectionException] Given object is not an instance of the class this property was declared in

#1  /var/www/symfony/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php:656
#2  /var/www/symfony/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php:514
#3  /var/www/symfony/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php:834
#4  /var/www/symfony/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php:355
#5  /var/www/symfony/vendor/doctrine/orm/lib/Doctrine/ORM/EntityManager.php:388
#6  /var/www/symfony/var/cache/test/ContainerSPzjQBW/EntityManager_9a5be93.php:136
#7  /var/www/symfony/vendor/theofidry/alice-data-fixtures/src/Bridge/Doctrine/Persister/ObjectManagerPersister.php:95
#8  /var/www/symfony/var/cache/test/ContainerSPzjQBW/ObjectManagerPersister_eccc052.php:39
#9  /var/www/symfony/vendor/theofidry/alice-data-fixtures/src/Loader/PersisterLoader.php:93
#10 /var/www/symfony/var/cache/test/ContainerSPzjQBW/PersisterLoader_c8a8e24.php:39

[derrabus]

• Please target the 2.3.x 2.4.x branch because this is a new feature.
• Please add tests.