field_group 8.x-3.0-beta1

This is the first beta release for fieldgroup with drupal core 8.3 and higher support. People with latest drupal 8 version should update to this version.
People that still use drupal core 8.2 or lower, should stay with 8.1 branch of fieldgroup.

A RC release will quickly follow, once #2878359: Field groups are not compatible with field layout is fixed. I encourage people to test that patch.

Changes since 8.x-1.x:

• #2910538 by cbeier, Almare: JS error: Modernizr is not defined
• Add the new region property to the schema
• #2842541 by philsward, zuuperman: Adding Multiple Fields wrapped by a Tabs Group cause maximum execution error
• #2843261 by borisson_, zuuperman: branch tests are failing
• #2881963 Fix the changing of regions.
• #2845805 by hyperlinked, philsward, zuuperman: Creating Duplicate Fieldgroup Name Overwrites Existing Fieldgroup
• #2878359: Field groups are not compatible with field layout. Part 1: Make sure regions are changed when changing layout
• #2846589 by huzooka, Jigar.addweb: Typo in Field Group Formatter Plugin HtmlElement::prerender
• Revert "Issue #2846589 by huzooka: Typo in Field Group Formatter Plugin HtmlElement::prerender"
• #2863155 by david.pashaev: Undefined index: form_display
• #2846589 by huzooka: Typo in Field Group Formatter Plugin HtmlElement::prerender
• #2856288 by rocket.man: Replace all deprecated uses
• #2872160 by nettantra: messageWarning: Invalid argument supplied for foreach() in field_group_info_groups() (line 663 of modules/contrib/field_group/field_group.module)
• Replace removed formBuilder->setError with formstate->setError
• #2849759 by Grimreaper: Undefined index: id in template_preprocess_fieldset() notice