Fixes

• Fixes a crash on iOS when deleting calendar events with special characters

Additions:

• Adds method to list device calendars (Android only)

Fixes:

• Fixed event creation in Android
• Fixed a crash when opening calendar without providing a date 
• Fixed crashes when returning to app if activity got destroyed

• Updated from version 4.5.5 to 5.1.3 by merging with original plugin Git repository.

• Fix DeleteEvent method that was returning Success False if the operation was successful

• Added method DeleteEventById