[ADD] website: add new page management

website.page = old ir.ui.view with page=True
website.redirect is a new mechanism to replace in the futur the ir.attachment
mechanism of redirect.

From now, we don't have a specific /page controller to serve 'page'.

We use a new model website.page which is rendered if none route matches the url
 and that the field 'url' on website.page matches the request.httprequest.path.

The order to serve a path is:
    - Routes defines in controllers (/shop, /blog, ...)
    - ir.attachment with name matching the path
    - website.page with url matching the path
    - website.redirect with url_from matching the path
    - 404

To improve:
    - allow regexp in website.redirect model
    - allow to edit the view_arch from the page.management via redirect backend
      (needed when traceback in the page, or when modifying a js/css/less/...)

addons/website/static/src/xml/website.contentMenu.xml

@@ -8,7 +8,7 @@
                 <span class="js_menu_label">
                     <t t-esc="submenu.name"/>
                 </span>
-                <i class="pull-right fa fa-home" style="margin-top: 3px"/>
+                <i t-if="submenu.is_homepage" class="pull-right fa fa-home" style="margin-top: 3px"/>
             </span>
             <span class="input-group-btn">
                 <button type="button" class="btn btn-primary js_edit_menu fa fa-pencil-square-o"/>
@@ -54,8 +54,12 @@
     <div class="form-group">
         <label class="control-label col-sm-3">Link</label>
         <div class="col-sm-9">
-            <input type="radio" name="link_menu_options" id="url" value="url" checked="checked"/> <label class="control-label mr16" for="url" >URL or Email</label>
-            <input type="radio" name="link_menu_options" id="new_page" value="new_page"/> <label class="control-label" for="new_page">New Page</label>
+            <div class="radio">
+                <label class="checkbox-inline" for="new_page"><input type="radio" name="link_menu_options" id="new_page" value="new_page" checked="checked"/>New Page</label>
+            </div>
+            <div class="radio">
+                <label class="checkbox-inline" for="url"><input type="radio" name="link_menu_options" id="url" value="url" />URL or Email</label>
+            </div>
         </div>
     </div>
 </t>