Added support for log stored in CMS_STORAGE.

Added support for custom value stored in CMS_STORAGE.
Added optional css classes addition to CMS_BLOCK output.
Refactored storage, to manage node from node module code only (or mostly).

TODO: improved view for a cms node, for now hardcoded.

src/kernel/content/cms_content_block.e

@@ -46,7 +46,7 @@ feature -- Access
 
 feature -- Status report
 
-	is_raw: BOOLEAN
+	is_raw: BOOLEAN assign set_is_raw
 			-- Is raw?
 			-- If True, do not get wrapped it with block specific div