Stable

1. Another Dark Theme v_detorte

Now we introduce another dark theme v_detorte from a Vim color scheme detorte.

It is more eye-friendly than v_moonlight in day time.

2. Others

• Explorer: fix the crash when no root entry is set;
• Support maximizing split Ctrl+E Shift+| and distributing splits Ctrl+E =;
• Support hiding tool bar Ctrl+E Shift+#;