Some minor improvements

* destroy/free/shutdown/close in reverse order of allocation
* more static/auto_Xfree
* less variables/strlen/GString
* properly `\0`-terminate string of testcase

Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>

src/ui/core.c

@@ -93,7 +93,6 @@ static void
 _ui_close(void)
 {
     g_timer_destroy(ui_idle_time);
-    endwin();
     notifier_uninit();
     cons_clear_alerts();
     wins_destroy();
@@ -102,6 +101,7 @@ _ui_close(void)
     free_title_bar();
     delwin(main_scr);
     delscreen(set_term(NULL));
+    endwin();
 }
 
 void