Chinese Translations

• Support [TOC]
• Fix MathJax
• Add shortcut for StayOnTop
• Add Markdown guide and shortcuts guide
• Show hovered link in read mode
• Smart Input Method in Vi mode
• Bug fix in Markdown editor when finding current heading index
• Add custom Info.plist on macOS
• Support minimizing to system tray
• Support restart
• Add read and edit in Markdown ViewWindow
• Add Chinese translations