Refactored and update CMS hooks design. (Move from CMS_RESPONSE to CMS_API).

Moved content_types and content_type_webform_managers from CMS_RESPONSE to CMS_API.
Updated the way to output content (node, ...) to html page.
   See CMS_CONTENT_TYPE_WEBFORM_MANAGER.append_cointent_as_html_to (...).
   Added notion of "teaser" (short version of the content), as opposed to full content.
One can use CMS_API.html_encoder ... when possible, same for `formats', ...
Added bridge from CMS_MODULE_API to CMS_API's encoders.
Added new CMS_TAXONOMY_HOOK used to retrieve list of content associated with a specific term.
Moved up to CMS_RESPONSE a few features which was available only in specific descendants.

Added /taxonomy/term/{termid} implementation.

modules/node/handler/node_response.e

@@ -42,15 +42,6 @@ feature -- Helpers
 
 feature -- Helpers: cms link
 
-	user_local_link (u: CMS_USER; a_opt_title: detachable READABLE_STRING_GENERAL): CMS_LOCAL_LINK
-		do
-			if a_opt_title /= Void then
-				create Result.make (a_opt_title, user_url (u))
-			else
-				create Result.make (u.name, user_url (u))
-			end
-		end
-
 	node_local_link (n: CMS_NODE; a_opt_title: detachable READABLE_STRING_GENERAL): CMS_LOCAL_LINK
 		do
 			if attached n.link as lnk then
@@ -59,17 +50,12 @@ feature -- Helpers: cms link
 				Result := node_api.node_link (n)
 			end
 			if a_opt_title /= Void and then not Result.title.same_string_general (a_opt_title) then
-				create Result.make (a_opt_title, Result.location)
+				Result := local_link (a_opt_title, Result.location)
 			end
 		end
 
 feature -- Helpers: html link
 
-	user_html_link (u: CMS_USER): like link
-		do
-			Result := link (u.name, "user/" + u.id.out, Void)
-		end
-
 	node_html_link (n: CMS_NODE; a_opt_title: detachable READABLE_STRING_GENERAL): like link
 		local
 			l_title: detachable READABLE_STRING_GENERAL
@@ -80,18 +66,10 @@ feature -- Helpers: html link
 				l_title := n.title
 			end
 			Result := link (l_title, node_api.node_path (n), Void)
-
 		end
 
 feature -- Helpers: URL		
 
-	user_url (u: CMS_USER): like url
-		require
-			u_with_id: u.has_id
-		do
-			Result := url ("user/" + u.id.out, Void)
-		end
-
 	node_url (n: CMS_NODE): like url
 		require
 			n_with_id: n.has_id