Drop versioncake dependency

versioncake doesn't support Rails 6 and isn't actively maintained.
For API v2 we've used serializers and we won't be using versioned views
in the future.

Author: damianlegawiec

.gitignore

@@ -43,10 +43,8 @@ public/google_base.xml
 public/template_google_base.xml
 coverage/*
 var
-TAGS
 nbproject
 ./vendor
-tags
 *.swp
 rerun.txt
 test_app

api/app/views/spree/api/errors/gateway_error.v1.rabl api/app/views/spree/api/errors/gateway_error.rabl

@@ -1,5 +1,4 @@
 require 'rails/engine'
-require 'versioncake'
 
 module Spree
   module Api
@@ -17,17 +16,6 @@ class Engine < Rails::Engine
         config.json_engine = ActiveSupport::JSON
       end
 
-      initializer 'spree.api.versioncake' do |_app|
-        VersionCake.setup do |config|
-          config.resources do |r|
-            r.resource %r{.*}, [], [], [1, 2]
-          end
-
-          config.missing_version = 1
-          config.extraction_strategy = :http_header
-        end
-      end
-
       # sets the manifests / assets to be precompiled, even when initialize_on_precompile is false
       initializer 'spree.assets.precompile', group: :all do |app|
         app.config.assets.precompile += %w[

api/app/views/spree/api/errors/invalid_api_key.v1.rabl api/app/views/spree/api/errors/invalid_api_key.rabl

@@ -1,5 +1,4 @@
 require 'spree/api'
 require 'spree/api/responders'
-require 'versioncake'
 require 'fast_jsonapi'
 require 'doorkeeper'

api/app/views/spree/api/errors/invalid_resource.v1.rabl api/app/views/spree/api/errors/invalid_resource.rabl

@@ -63,11 +63,6 @@
     Spree::Api::Config[:requires_authentication] = true
   end
 
-  config.include VersionCake::TestHelpers, type: :controller
-  config.before(:each, type: :controller) do
-    set_request_version('', 1)
-  end
-
   config.order = :random
   Kernel.srand config.seed
 end

api/app/views/spree/api/errors/must_specify_api_key.v1.rabl api/app/views/spree/api/errors/must_specify_api_key.rabl

@@ -21,7 +21,6 @@ Gem::Specification.new do |s|
 
   s.add_dependency 'spree_core', s.version
   s.add_dependency 'rabl', '~> 0.13.1'
-  s.add_dependency 'versioncake', '~> 3.4.0'
   s.add_dependency 'fast_jsonapi', '~> 1.5'
   s.add_dependency 'doorkeeper', '~> 5.0'
 end

api/app/views/spree/api/errors/not_found.v1.rabl api/app/views/spree/api/errors/not_found.rabl

@@ -109,11 +109,6 @@
 
   config.include Spree::Core::ControllerHelpers::StrongParameters, type: :controller
 
-  config.include VersionCake::TestHelpers, type: :controller
-  config.before(:each, type: :controller) do
-    set_request_version('', 1)
-  end
-
   config.verbose_retry = true
   config.display_try_failure_messages = true