libdcp/test/smpte_subtitle_test.cc, branch utf8

Fix tests again on Windows.

2023-02-27T09:46:36Z

Fix tests with different library versions.

2023-02-26T19:56:34Z

Be explicit about the version of SMPTE 428-7 that is used for subtitles,

2023-02-17T23:35:01Z

and default to writing the 2014 namespace.

In Deluxe's "Specifications for Digital Cinema Source and DCP Content Delivery"

2023-02-02T00:37:16Z

they say that subtitle must be of the form yyyy-mm-ddThh:mm:ss They don't explain it, and the standards don't say this (as far as I can see) but as usual their QC fails that don't meet this "spec" so here we are. See also: https://dcpomatic.com/forum/viewtopic.php?t=2069

Fix some ambiguous shared_ptrs, seen on Arch Linux.

2022-12-04T20:52:29Z

Add a couple of Z position tests.

2022-11-03T08:31:53Z

Add Z position to subtitles; existing tests pass.

2022-11-03T08:31:53Z

Fix some macOS signed/unsigned warnings.

2022-04-22T10:22:44Z

Nearly pretty-print subtitle XML (though not in nodes).

2022-03-20T20:20:58Z

This is an attempt to fix DoM bug #2205.

Order subtitles in the XML according to their vertical position (DoM bug #2106).

2021-10-24T18:52:11Z