Move list of payment actions from card to gateway

We currently ask the credit card first which payment actions like "void"
it supports. But all the logic is not card specifc. It depends on the
payment method which actions it supports.

And instead of having two different classes potentially being the source
of truth for actions, I prefer leaving that responsibility with exactly
one class, the payment method.

I'll move the `can_?` methods next.

app/models/spree/credit_card.rb

@@ -63,10 +63,6 @@ module Spree
       "XXXX-XXXX-XXXX-#{last_digits}"
     end
 
-    def actions
-      %w{capture_and_complete_order void credit resend_authorization_email}
-    end
-
     def can_resend_authorization_email?(payment)
       payment.requires_authorization?
     end

app/models/spree/gateway.rb

@@ -13,6 +13,10 @@ module Spree
     preference :server, :string, default: 'live'
     preference :test_mode, :boolean, default: false
 
+    def actions
+      %w{capture_and_complete_order void credit resend_authorization_email}
+    end
+
     def payment_source_class
       CreditCard
     end

app/models/spree/payment.rb

@@ -152,9 +152,9 @@ module Spree
     end
 
     def actions
-      return [] unless payment_source.respond_to?(:actions)
+      return [] unless payment_method.respond_to?(:actions)
 
-      payment_source.actions.select do |action|
+      payment_method.actions.select do |action|
         !payment_source.respond_to?("can_#{action}?") ||
           payment_source.__send__("can_#{action}?", self)
       end