added sm_dump_handles command for tracking down Handle leaks... more to come someday

--HG--
extra : convert_revision : svn%3A39bc706e-5318-0410-9160-8a85361fbb7c/trunk%40906

core/systems/PluginSys.cpp

@@ -1961,3 +1961,13 @@ void CPluginManager::AddFunctionsToForward(const char *name, IChangeableForward
 		}
 	}
 }
+
+CPlugin *CPluginManager::GetPluginFromIdentity(IdentityToken_t *pToken)
+{
+	if (pToken->type != g_PluginIdent)
+	{
+		return NULL;
+	}
+
+	return (CPlugin *)(pToken->ptr);
+}