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/Common/Manager/OptionsManagerAbstract.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace Box\Spout\Common\Manager;
+
+/**
+ * Class OptionsManager
+ *
+ * @package Box\Spout\Common\Manager
+ */
+abstract class OptionsManagerAbstract implements OptionsManagerInterface
+{
+    const PREFIX_OPTION = 'OPTION_';
+
+    /** @var string[] List of all supported option names */
+    private $supportedOptions = [];
+
+    /** @var array Associative array [OPTION_NAME => OPTION_VALUE] */
+    private $options = [];
+
+    /**
+     * OptionsManagerAbstract constructor.
+     */
+    public function __construct()
+    {
+        $this->supportedOptions = $this->getSupportedOptions();
+        $this->setDefaultOptions();
+    }
+
+    /**
+     * @return array List of supported options
+     */
+    abstract protected function getSupportedOptions();
+
+    /**
+     * Sets the default options.
+     * To be overriden by child classes
+     *
+     * @return void
+     */
+    abstract protected function setDefaultOptions();
+
+    /**
+     * Sets the given option, if this option is supported.
+     *
+     * @param string $optionName
+     * @param mixed $optionValue
+     * @return void
+     */
+    public function setOption($optionName, $optionValue)
+    {
+        if (in_array($optionName, $this->supportedOptions)) {
+            $this->options[$optionName] = $optionValue;
+        }
+    }
+
+    /**
+     * @param string $optionName
+     * @return mixed|null The set option or NULL if no option with given name found
+     */
+    public function getOption($optionName)
+    {
+        $optionValue = null;
+
+        if (isset($this->options[$optionName])) {
+            $optionValue = $this->options[$optionName];
+        }
+
+        return $optionValue;
+    }
+}