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/Reader/CSV/Creator/EntityFactory.php

@@ -0,0 +1,65 @@
+<?php
+
+namespace Box\Spout\Reader\CSV\Creator;
+
+use Box\Spout\Common\Creator\HelperFactory;
+use Box\Spout\Common\Helper\GlobalFunctionsHelper;
+use Box\Spout\Common\Manager\OptionsManagerInterface;
+use Box\Spout\Reader\Common\Creator\EntityFactoryInterface;
+use Box\Spout\Reader\CSV\RowIterator;
+use Box\Spout\Reader\CSV\Sheet;
+use Box\Spout\Reader\CSV\SheetIterator;
+
+/**
+ * Class EntityFactory
+ * Factory to create entities
+ *
+ * @package Box\Spout\Reader\CSV\Creator
+ */
+class EntityFactory implements EntityFactoryInterface
+{
+    /** @var HelperFactory */
+    private $helperFactory;
+
+    /**
+     * @param HelperFactory $helperFactory
+     */
+    public function __construct(HelperFactory $helperFactory)
+    {
+        $this->helperFactory = $helperFactory;
+    }
+
+    /**
+     * @param resource $filePointer Pointer to the CSV file to read
+     * @param OptionsManagerInterface $optionsManager
+     * @param GlobalFunctionsHelper $globalFunctionsHelper
+     * @return SheetIterator
+     */
+    public function createSheetIterator($filePointer, $optionsManager, $globalFunctionsHelper)
+    {
+        return new SheetIterator($filePointer, $optionsManager, $globalFunctionsHelper, $this);
+    }
+
+    /**
+     * @param resource $filePointer Pointer to the CSV file to read
+     * @param OptionsManagerInterface $optionsManager
+     * @param GlobalFunctionsHelper $globalFunctionsHelper
+     * @return Sheet
+     */
+    public function createSheet($filePointer, $optionsManager, $globalFunctionsHelper)
+    {
+        return new Sheet($filePointer, $optionsManager, $globalFunctionsHelper, $this);
+    }
+
+    /**
+     * @param resource $filePointer Pointer to the CSV file to read
+     * @param OptionsManagerInterface $optionsManager
+     * @param GlobalFunctionsHelper $globalFunctionsHelper
+     * @return RowIterator
+     */
+    public function createRowIterator($filePointer, $optionsManager, $globalFunctionsHelper)
+    {
+        $encodingHelper = $this->helperFactory->createEncodingHelper($globalFunctionsHelper);
+        return new RowIterator($filePointer, $optionsManager, $encodingHelper, $globalFunctionsHelper);
+    }
+}