More Stable

• Support editing external files. VNote could open files from command line.
• Support drag-and-drop to open external files.
• Refine tab context menu.
• Support system tray icon.
• Refine Vim mode.
• Make all tool buttons always visible and smaller.
• Support custom file type suffix.
• Make the name of notebook/folder/note case-insensitive.
• Support links to internal notes in notes.