- Added basic infrastructure to plugin system in libretroshare and retroshare-gui.

- ported LinksCloud to a new plugin, and removed it from main sources

Next moves:
- add gui for managing plugins
- handle windows compilation



git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@4275 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/plugins/pluginclasses.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <dbase/cachestrapper.h>
+
+// The following class abstracts the construction of a cache service. The user only has to 
+// supply RS with a type ID. If the ID is already in use, RS will complain.
+//
+class RsCacheService: public CacheSource, public CacheStore, public p3Config
+{
+	public:
+		RsCacheService(uint16_t type,uint32_t config_type,uint32_t tick_delay_in_seconds) ;
+
+		uint32_t tickDelay() const { return _tick_delay_in_seconds ; }
+		virtual void tick() {}
+
+		// Functions from p3config
+		//
+		virtual RsSerialiser *setupSerialiser() { return NULL ; }
+		virtual bool saveList(bool&, std::list<RsItem*>&) { return false ;}
+		virtual bool loadList(std::list<RsItem*>&) { return false ;}
+
+	private:
+		uint32_t _tick_delay_in_seconds ;
+};
+