Issue #3495740 by jwilson3: Use hook_field_widget_complete_form_alter()

Closes #3495740

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• eb6e5246 - Handle empty description string

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• 44d154df - Improve code comments
• b82cd6fa - Ensure Element::children works
• d1dbc38d - Improve support for basic field types
• 676581ee - Add dev dependencies for testing contrib modules

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• a19cc0ce - Expand and improve label help test content types

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