Support for a 4-4-5 calendar

[adamjstewart]

A user is requesting support for a 4-4-5 calendar. This is quite a bit different than the original implementation I went with, but is inline with my original goals. This will likely require a major refactoring of the module, so it may take some time.

If you also would like to see support for 4-4-5, 4-5-4, or 5-4-4 calendars, give this post a 👍. If you want to see support for a different calendar, open another issue. If you have any suggestions for how to implement a 4-4-5 calendar, including the UI for selecting which calendar to use, feel free to post a comment on this issue.

[snehalvartak]

👍