RFC: change mapping to chain mapper

[Milan Felix Šulc]

I would like to change internal mapping driver to DriverChain. It would be more suitable for separate extensions, each could register own mapper, or for modular system.

Snippet from doc: https://www.doctrine-project.org/projects/doctrine-orm/en/2.6/reference/advanced-configuration.html#multiple-metadata-sources

$chain = new DriverChain(); 
$chain->addDriver($xmlDriver, 'Doctrine\Tests\Models\Company'); 
$chain->addDriver($yamlDriver, 'Doctrine\Tests\ORM\Mapping');

[Milan Felix Šulc]

cc @uestla @jiripudil @MartkCz @aleswita

[Marek Bartoš]

@f3l1x Couldn't we do same thing in Apitte?

[Milan Felix Šulc]

Sure. Good idea.

[Milan Felix Šulc]

Will be implemented in v0.6.