Reformatted code and added support for all payment methods

This commit adds the following payment methods:
- EPS
- Giftcards
- Giropay
- ING Home'Pay
- KBC/CBC

I've also ran a reformatter to clean up the code and added composer
instead of git modules. The latter enables us to keep up-to-date
with the last Mollie library in a more modern manner.

src/molliepaysafecard_devapp.php

@@ -2,19 +2,21 @@
 
 require_once __DIR__ . '/mollie/mollie.php';
 
-function molliepaysafecard_devapp_config() {
-	$config = mollie_config();
+function molliepaysafecard_devapp_config()
+{
+    $config = mollie_config();
 
-	$config = array_merge($config, array(
-		'FriendlyName' => array(
-			'Type' => 'System',
-			'Value'=> 'Mollie Paysafecard'
-		)
-	));
+    $config = array_merge($config, array(
+        'FriendlyName' => array(
+            'Type' => 'System',
+            'Value' => 'Mollie Paysafecard'
+        )
+    ));
 
-	return $config;
+    return $config;
 }
 
-function molliepaysafecard_devapp_link($params) {
-	return mollie_link($params, Mollie_API_Object_Method::PAYSAFECARD);
+function molliepaysafecard_devapp_link($params)
+{
+    return mollie_link($params, \Mollie\Api\Types\PaymentMethod::PAYSAFECARD);
 }