Refactor readers for better di (#457)

* Refactor readers to get a proper DI

Similar to what was done with writers, readers also needed to be updated to match the new way of doing things.
This commits promotes a better DI (factories, injection through constructors).

* Escapers should not be singletons

Instead, they should be proper object that can be injected where needed.

src/Spout/Writer/WriterAbstract.php

@@ -9,7 +9,7 @@ use Box\Spout\Common\Helper\FileSystemHelper;
 use Box\Spout\Common\Helper\GlobalFunctionsHelper;
 use Box\Spout\Writer\Common\Entity\Options;
 use Box\Spout\Writer\Common\Entity\Style\Style;
-use Box\Spout\Writer\Common\Manager\OptionsManagerInterface;
+use Box\Spout\Common\Manager\OptionsManagerInterface;
 use Box\Spout\Writer\Common\Manager\Style\StyleMerger;
 use Box\Spout\Writer\Exception\WriterAlreadyOpenedException;
 use Box\Spout\Writer\Exception\WriterNotOpenedException;