Allow for starter_frontend rename

The changes here won't necessarily be merged at the exact same time as
the other changes to solidus_storefront/starter_frontend so I made this
all work with either name.

Author: AlistairNorman

lib/generators/solidus_paypal_commerce_platform/install/install_generator.rb

@@ -16,7 +16,7 @@ class InstallGenerator < Rails::Generators::Base
       def normalize_components_options
         @components = {
           backend: options[:backend],
-          starter_frontend: options[:frontend] == 'starter',
+          storefront: options[:frontend] == 'starter' || options[:frontend] == 'storefront',
           classic_frontend: options[:frontend] == 'classic',
         }
       end
@@ -43,15 +43,21 @@ def install_solidus_backend_support
         end
       end
 
-      def install_solidus_starter_frontend_support
-        support_code_for(:starter_frontend) do
+      def install_solidus_storefront_support
+        support_code_for(:storefront) do
           directory 'app', 'app'
+          js_manifest = File.exist?('app/assets/javascripts/solidus_storefront.js') ?
+            'app/assets/javascripts/solidus_storefront.js' :
+            'app/assets/javascripts/solidus_starter_frontend.js'
+          css_manifest = File.exist?('app/assets/stylesheets/solidus_storefront.css') ?
+            'app/assets/stylesheets/solidus_storefront.css' :
+            'app/assets/stylesheets/solidus_starter_frontend.css'
           append_file(
-            'app/assets/javascripts/solidus_starter_frontend.js',
+            js_manifest,
             "//= require spree/frontend/solidus_paypal_commerce_platform\n"
           )
           inject_into_file(
-            'app/assets/stylesheets/solidus_starter_frontend.css',
+            css_manifest,
             " *= require spree/frontend/solidus_paypal_commerce_platform\n",
             before: %r{\*/},
             verbose: true,

spec/solidus_paypal_commerce_platform_spec_helper.rb

@@ -1,5 +1,9 @@
 # frozen_string_literal: true
 
-require 'solidus_starter_frontend_spec_helper'
+begin
+  require 'solidus_storefront_spec_helper'
+rescue LoadError
+  require 'solidus_starter_frontend_spec_helper'
+end
 
 Dir["#{__dir__}/support/solidus_paypal_commerce_platform/**/*.rb"].sort.each { |f| require f }