Issue #2760619 by dcam: 404 errors on sites with unsupported language codes.
Issue #2759545: Strip HTML tags from dates.
Changed plugin settings form fieldsets to details.
Issue #2602910 by dcam, Liam Morland: Fix undefined index notices
Issue #2549435 by dcam, lily.yan: Undefined indexes when creating feature
Issue #2497003 by iStryker, Liam Morland: Undefined index: image_style
Updated the Media field configuration documentation in the README file.
Added media field configuration documentation to the README file.
Issue #2531566 by elondaits: Default font setting for TimelineJS is "default", not ""
Updated the README file with new TimelineJS download instructions.
Backported library name and theme function changes from 8.x-3.x.
Fixed an issue where the embed div height was inconsistent.
Updated the README file.
Added the plugin settings schema.
Updated the plugin theme function to the 8.x API.
Converted the library definitions to the 8.x API.
Fixed the plugin language option.
Converted the style plugin to PSR-4.
Converted the TimelineJS PHP library to PSR-4.
Converted the admin settings form into Form\SettingsForm.
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