Improved plugin system:

- the user is asked at start wether to load or deny unregistered plugins, but can make it mind later in config->plugins
- added API and SVN numbers into required external plugin symbols
- user-defined plugin rules are dropped when a plugin changes (hash changes) or when the main executable changes.
- added new status flags (Plugin denied, missing API/SVN numbers)
- modified saveList()/loadList() to allow saving a list of rejected plugins as well.
- added methods in notifyBase and inherited classes to ask for plugin confirmation.

- adapted VOIP plugin to follow these new rules (API+SVN numbers). Other plugins should be adapted as well by addign the 
 missing symbols (RETROSHARE_PLUGIN_api and RETROSHARE_PLUGIN_revision).



git-svn-id: http://svn.code.sf.net/p/retroshare/code/trunk@5529 b45a01b8-16f6-495d-af2f-9b41ad6348cc

libretroshare/src/retroshare/rsplugin.h

@@ -52,14 +52,22 @@ class RsPQIService ;
 class RsAutoUpdatePage ;
 class PopupChatDialog ;
 
+// Plugin API version. Not used yet, but will be in the future the
+// main value that decides for compatibility.
+//
+#define RS_PLUGIN_API_VERSION        0x000101
+
 // Used for the status of plugins.
 //
 #define PLUGIN_STATUS_NO_STATUS      0x0000
-#define PLUGIN_STATUS_UNKNOWN_HASH   0x0001
+#define PLUGIN_STATUS_REJECTED_HASH  0x0001
 #define PLUGIN_STATUS_DLOPEN_ERROR   0x0002
 #define PLUGIN_STATUS_MISSING_SYMBOL 0x0003
 #define PLUGIN_STATUS_NULL_PLUGIN    0x0004
 #define PLUGIN_STATUS_LOADED         0x0005
+#define PLUGIN_STATUS_WRONG_API      0x0006
+#define PLUGIN_STATUS_MISSING_API    0x0007
+#define PLUGIN_STATUS_MISSING_SVN    0x0008
 
 class RsPluginHandler;