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.

tests/Spout/Writer/Common/Manager/OptionsManagerTest.php

@@ -1,70 +0,0 @@
-<?php
-
-namespace Box\Spout\Writer\Common\Manager;
-
-/**
- * Class OptionsManagerTest
- *
- * @package Box\Spout\Writer\Common\Manager
- */
-class OptionsManagerTest extends \PHPUnit_Framework_TestCase
-{
-    /**
-     * @return void
-     */
-    public function testOptionsManagerShouldReturnDefaultOptionsIfNothingSet()
-    {
-        $optionsManager = new FakeOptionsManager();
-        $this->assertEquals('foo-val', $optionsManager->getOption('foo'));
-        $this->assertEquals(false, $optionsManager->getOption('bar'));
-    }
-
-    /**
-     * @return void
-     */
-    public function testOptionsManagerShouldReturnUpdatedOptionValue()
-    {
-        $optionsManager = new FakeOptionsManager();
-        $optionsManager->setOption('foo', 'new-val');
-        $this->assertEquals('new-val', $optionsManager->getOption('foo'));
-    }
-
-    /**
-     * @return void
-     */
-    public function testOptionsManagerShouldReturnNullIfNoDefaultValueSet()
-    {
-        $optionsManager = new FakeOptionsManager();
-        $this->assertNull($optionsManager->getOption('baz'));
-    }
-
-    /**
-     * @return void
-     */
-    public function testOptionsManagerShouldReturnNullIfNoOptionNotSupported()
-    {
-        $optionsManager = new FakeOptionsManager();
-        $optionsManager->setOption('not-supported', 'something');
-        $this->assertNull($optionsManager->getOption('not-supported'));
-    }
-}
-
-
-// TODO: Convert this to anonymous class when PHP < 7 support is dropped
-class FakeOptionsManager extends OptionsManagerAbstract
-{
-    protected function getSupportedOptions()
-    {
-        return [
-            'foo',
-            'bar',
-            'baz',
-        ];
-    }
-
-    protected function setDefaultOptions()
-    {
-        $this->setOption('foo', 'foo-val');
-        $this->setOption('bar', false);
-    }
-}