core: add signals for plugins loaded/unloaded

src/plugins/plugin.c

@@ -848,6 +848,9 @@ plugin_load (const char *filename, int argc, char **argv)
                          name);
     }
 
+    hook_signal_send ("plugin_loaded", WEECHAT_HOOK_SIGNAL_STRING,
+                      (char *)filename);
+
     return new_plugin;
 }
 
@@ -1030,6 +1033,7 @@ plugin_unload (struct t_weechat_plugin *plugin)
                          _("Plugin \"%s\" unloaded"),
                          (name) ? name : "???");
     }
+    hook_signal_send ("plugin_unloaded", WEECHAT_HOOK_SIGNAL_STRING, name);
     if (name)
         free (name);
 }