Add TimeZoneVariant::Sundown and use it for Morocco

[robertbastian]

This is option 4 from https://unicode-org.atlassian.net/browse/CLDR-18795

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[sffc]

I do think that we should support a display name during Ramadan time, not printing the Localized GMT, which is not user-friendly.

[robertbastian]

This PR is not ready to be reviewed. You can leave comments on the CLDR issue

.