Add support for converting product common properties to individual ones

Add filter wc1c_import_xml_property, add predefining product properties and requisites arrays.


git-svn-id: https://plugins.svn.wordpress.org/woocommerce-and-1centerprise-data-exchange/trunk@1029841 b8457f37-d9ea-0310-8a92-e5e31aec5664