Converted the REDMINE_SUPPORTED_SCM constant to a class

Now SCMs can be added or removed using a simple API, instead of being
hardcoded:

  Redmine::Scm::Base.add('ScmName')
  Redmine::Scm::Base.delete('ScmName')

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@3440 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/application_controller.rb

@@ -46,7 +46,7 @@ class ApplicationController < ActionController::Base
   include Redmine::MenuManager::MenuController
   helper Redmine::MenuManager::MenuHelper
   
-  REDMINE_SUPPORTED_SCM.each do |scm|
+  Redmine::Scm::Base.all.each do |scm|
     require_dependency "repository/#{scm.underscore}"
   end
 

app/helpers/repositories_helper.rb

@@ -126,7 +126,7 @@ module RepositoriesHelper
   
   def scm_select_tag(repository)
     scm_options = [["--- #{l(:actionview_instancetag_blank_option)} ---", '']]
-    REDMINE_SUPPORTED_SCM.each do |scm|
+    Redmine::Scm::Base.all.each do |scm|
       scm_options << ["Repository::#{scm}".constantize.scm_name, scm] if Setting.enabled_scm.include?(scm) || (repository && repository.class.name.demodulize == scm)
     end
     

app/views/settings/_repositories.rhtml

@@ -13,7 +13,7 @@
   <%= link_to_function l(:label_generate_key), "if ($('settings_sys_api_key').disabled == false) { $('settings_sys_api_key').value = randomKey(20) }" %>
 </p>
 
-<p><%= setting_multiselect(:enabled_scm, REDMINE_SUPPORTED_SCM) %></p>
+<p><%= setting_multiselect(:enabled_scm, Redmine::Scm::Base.all) %></p>
 
 <p><%= setting_text_field :repositories_encodings, :size => 60 %><br />
 <em><%= l(:text_comma_separated) %></em></p>