[+] Install: new installer reworked from scratch

install-new/fixtures/apple/data/cart.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<entity_cart>
+	<fields class="Cart">
+		<field name="id_carrier" relation="carrier" />
+		<field name="id_address_delivery" relation="address" />
+		<field name="id_address_invoice" relation="address" />
+		<field name="id_currency" />
+		<field name="id_customer" relation="customer" />
+		<field name="id_guest" relation="guest" />
+		<field name="secure_key" />
+		<field name="recyclable" />
+		<field name="gift" />
+		<field name="gift_message" />
+	</fields>
+
+	<entities>
+		<cart id="cart_1" id_carrier="My_carrier" id_address_delivery="Mon_adresse" id_address_invoice="Mon_adresse" id_currency="1" id_customer="John" id_guest="guest_1" secure_key="-1" recyclable="1" gift="0">
+			<gift_message><![CDATA[]]></gift_message>
+		</cart>
+	</entities>
+</entity_cart>