Working on zeitwerk support

Author: alexandermeindl

.rubocop.yml

@@ -85,4 +85,4 @@ Naming/VariableNumber:
 Rails/OutputSafety:
   Enabled: true
   Exclude:
-    - 'lib/redmine_ref_issues/macro.rb'
+    - lib/redmine_ref_issues/wiki_macros/ref_issues_macro.rb

init.rb

@@ -14,6 +14,8 @@
   requires_redmine version_or_higher: '4.1'
 end
 
-Rails.configuration.to_prepare do
-  RedmineRefIssues.setup
+if Rails.version > '6.0'
+  ActiveSupport.on_load(:active_record) { RedmineRefIssues.setup }
+else
+  Rails.configuration.to_prepare { RedmineRefIssues.setup }
 end

lib/redmine_ref_issues.rb

@@ -1,12 +1,11 @@
 # frozen_string_literal: true
 
-require 'redmine_ref_issues/version'
-
 module RedmineRefIssues
+  VERSION = '1.0.1'
+
   class << self
     def setup
-      require_dependency 'redmine_ref_issues/parser'
-      require_dependency 'redmine_ref_issues/macro'
+      Additionals.load_macros 'redmine_ref_issues'
     end
 
     def cast_table_field(db_table, db_field)