Redesigned hooks system (moving from CMS_RESPONSE to CMS_API).

Indeed, hooks does not require RESPONSE interface,
   and should be setup before, at the system level (i.e CMS_API)
Added exportation solution via CMS_HOOK_EXPORT.
Updated blocks settings for demo example project.

examples/demo/site/config/blocks.ini

@@ -9,30 +9,17 @@ management.conditions[]=is_front
 feed.news.weight=3
 feed.news.region=feed_news
 feed.news.region=content
-feed.news.condition=<none>
+feed.news.condition=is_front
+
 feed.forum.weight=2
 feed.forum.region=feed_forum
-feed.forum.region=<none>
-feed.forum.condition=<none>
-feed.forum.options[size]=15
+feed.forum.region=content
+feed.forum.condition=is_front
+feed.forum.options[size]=5
 
 #Updates
 recent_changes.region=content
 recent_changes.condition=is_front
 recent_changes.title=Updates
-recent_changes.options[size]=3
-
-#Aliases
-&aliases[foo]=management
-&aliases[bar]=feed.forum
-
-foo.region=content
-foo.condition=is_front
-foo.weight=-10
-
-bar.region=content
-bar.condition=is_front
-bar.title=Bar
-
-
+recent_changes.options[size]=4