v2.0.0

Release Note

• NEW: support sound by Linux kernel module snd-aloop, ffmpeg and flv.js
• NEW: USER and PASSWORD to login desktop with normal user
• NEW: RESOLUTION to set fixed screen size
• NEW: HTTP_PASSWORD to authenticate with HTTP base access
• NEW: SSL_PORT to support HTTPS
• CHANGE: Remove built-in application: libreoffice pinta
• REFACTOR: code structure