Add support for multidimensionnal form in front
	new file:   core/lib/Thelia/Config/Resources/form-types.xml
	modified:   core/lib/Thelia/Config/Resources/form.xml
	modified:   core/lib/Thelia/Controller/BaseController.php
	modified:   core/lib/Thelia/Core/Event/TheliaFormEvent.php
	new file:   core/lib/Thelia/Core/Form/Type/StandardFieldsType.php
	modified:   core/lib/Thelia/Core/Template/Smarty/Plugins/Form.php
	modified:   core/lib/Thelia/Form/BaseForm.php
	new file:   core/lib/Thelia/Form/EmptyForm.php
	modified:   core/lib/Thelia/Tests/Resources/Form/TestForm.php
	modified:   core/lib/Thelia/Tests/Resources/Form/Type/TestType.php
Modify parserContext storing to handle unique type form
	modified:   core/lib/Thelia/Core/Template/ParserContext.php
	modified:   core/lib/Thelia/Core/Template/Smarty/Plugins/Form.php