UDADuration: add age and countdown format styles
#4014
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Copy the unit test from "relative" for the positive case of "countdown", since the code as implemented for "countdown" is identical to the code for "relative". I am including this commit, even though the next commit will override it, to confirm my understanding of how the existing datetime styles work. Initially I had gotten myself turned in circles because I misread the "if now < date then add a - sign" logic as an absolute-value calculation and badly misunderstood the behavior of "age" and "relative". See GothenburgBitFactory#4013
The "countdown" format has been the same as the "relative" format, except that negative durations are not rendered, for about a decade. (There was a minor fix in GothenburgBitFactory#1840.) However, the example text shows something that looks like 00:00:00. This is how "countdown" was originally rendered but this was changed as part of the "isodate" branch in 995de68. See GothenburgBitFactory#4013 for more information. Fixes GothenburgBitFactory#4013
For compatibility reasons I couldn't simply rename "default", so I just added a new "iso" as a synonym. While I was in there I added some example output. There are currently no tests for UDA durations so I added one.
…format I just copied the logic for this from ColumnTypeDate. I also grepped around for other instances of `formatVague`. I don't know what the argument means but in this project it's set to `true` 100% of the time so I kept it that way. I am using the name "age" as suggested in GothenburgBitFactory#3738
In the same format as ColTypeDatetime. Fixes GothenburgBitFactory#3738
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As we do for datetimes, allow duration UDAs in reports to be formatted in the "vague" human-readable format or as a second-resolution countdown, instead of only the ISO format. I also added tests for the UDA duration output.
Along the way I attempted to support negative durations but was not able to -- see GothenburgBitFactory/libshared#110 for more information. I will open a followup if that PR (or its sister PR 111) gets into libshared.
Because the countdown format for datetime seemed wrong, I fixed it before implementing the same format for duration. Maybe I should have done this in a separate PR? Let me know and I will split it up.
Fixes #3738
Fixes #4013