Introduce the DateFmtInfo object.

[ehoogerbeets]

NOT READY TO MERGE YET.

Gives information about the date format without cluttering up the methods on the date format object itself. The methods on the date format object are now deprecated and will be removed in ilib 16.X

Checklist

• [ ] At least one test case is included for this feature or bug fix.
• [ ] ReleaseNotes has added or is not needed.
• [ ] This PR has passed all of the test cases on Nodejs and Chrome Browser.
• [ ] This PR has passed all of the test cases on QT/QML.
• [ ] This is an API breaking change.
• [ ] Requires a major version change.

Issue Resolved / Feature Added

Resolution

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