Next step towards customisable mode keys: build each default table of keys into

a named tree on start and use that for lookups. Also add command to string
translation tables and modify list-keys to show the the mode key bindings (new
-t argument).

server.c

@@ -160,6 +160,7 @@ server_start(char *path)
 	ARRAY_INIT(&windows);
 	ARRAY_INIT(&clients);
 	ARRAY_INIT(&sessions);
+	mode_key_init_trees();
 	key_bindings_init();
 	utf8_build();
 
@@ -379,6 +380,7 @@ server_main(int srv_fd)
 	}
 	ARRAY_FREE(&clients);
 
+	mode_key_free_trees();
 	key_bindings_free();
 
 	close(srv_fd);