Update timezone information

Update of timezone information to latest version 2021a

Update timezone info

Update of timezone information to latest version 2019c

Absolute trigger for alarm

• Add function to set absolute trigger date and time for an alarm
• Update timezone information to latest version 2019a

Update timezone info

• Update of timezone information to latest version 2018g

Update timezone info

• Update of timezone information to latest version 2018d

Fix for alarm component

• Alarm component is now correctly nested inside an event or a todo component

Alarm component

• Alarm component is now supported for events and todos
• Tests are PHP 7.x+ now
• Durations can be negative

Update timezone info

• Update of timezone information to latest version 2017c

Time zone rule definition order

• Change order of time zone rules because some server needs the latest definitions at the end

New package name

Package name is now identical to repository name.