Closed access shops

As a business user I would like to have private shops where customers cannot view anything without valid login. All customers' registrations must be approved by shop owner.

TECH

• add SHOP_SF_REQUIRE_LOGIN attribute to the shop
• add additional web filter to redirect all requests to login/registration page for SHOP_REQUIRE_LOGIN shops if the customer is not logged in
• (YCE only) modify admin to have extra panel for customer types settings
• add SHOP_SF_REQUIRE_REG_APPROVE_TYPES property to the shop
• modify registration mechanism so that accounts are created with disabled shop links if SHOP_REQUIRE_REG_APPROVE is set
• add new customer registration admin email template, so that shop owners are notified and can enable accounts
• add SHOP_SF_REQUIRE_REG_NOTIFY_TYPES property to the shop
• add new customer registration admin email template, so that shop owners are notified and can track account creation of certain types (or even all of them)