FEATURE: New "Plugins" admin section with extensibility support

lib/plugin/instance.rb

@@ -6,6 +6,7 @@ require_dependency 'plugin/auth_provider'
 class Plugin::Instance
 
   attr_accessor :path, :metadata
+  attr_reader :admin_route
 
   # Memoized array readers
   [:assets, :auth_providers, :color_schemes, :initializers, :javascripts, :styles].each do |att|
@@ -39,6 +40,10 @@ class Plugin::Instance
     end
   end
 
+  def add_admin_route(label, location)
+    @admin_route = {label: label, location: location}
+  end
+
   def enabled?
     return @enabled_site_setting ? SiteSetting.send(@enabled_site_setting) : true
   end