Basic feature and old messy code

This feature can work with Magic Mirror version after v2.11.0

In V1.0, we have:

1. Google Calendar:

• Add more than one google calendar
• Can change color, and title name for each google calendar
• Button to switch between calendars
• Send alert notification if event will happen within 5'
• Play alert sound if event will happen within 5'
• Refresh all calendar every minute

2. Viet Nam Calendar

• Show lunar events in a month
• Show VietNam and international events in a month
• Show/hide lunar date of events
• Can add your personal events, and they only show in current month
• Can change color for VietName Calendar