Remove cas auth from core and convert the settings over so they can be used by the plugin

lib/auth/cas_authenticator.rb

@@ -1,47 +0,0 @@
-class Auth::CasAuthenticator < Auth::Authenticator
-
-  def name
-    'cas'
-  end
-
-  def after_authenticate(auth_token)
-    result = Auth::Result.new
-
-    email = auth_token[:info][:email] if auth_token[:info]
-    email ||= if SiteSetting.cas_domainname.present?
-      "#{auth_token[:extra][:user]}@#{SiteSetting.cas_domainname}"
-    else
-      auth_token[:extra][:user]
-    end
-
-    result.email = email
-    result.email_valid = true
-
-    result.username = username = auth_token[:extra][:user]
-
-    result.name = name = if auth_token[:info] && auth_token[:info][:name]
-      auth_token[:info][:name]
-    else
-      auth_token["uid"]
-    end
-
-    cas_user_id = auth_token["uid"]
-
-    result.extra_data = {
-      cas_user_id: cas_user_id
-    }
-
-    user_info = CasUserInfo.where(:cas_user_id => cas_user_id ).first
-
-    result.user = user_info.try(:user)
-    result.user ||= User.where(email: email).first
-    # TODO, create CAS record ?
-
-    result
-  end
-
-  def register_middleware(omniauth)
-    omniauth.provider :cas,
-           :host => SiteSetting.cas_hostname
-  end
-end