entity_browser 8.x-1.0-alpha3

Entity browser 8.x-1.0-alpha3
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- #2671378 by dawehner, arknoll, javivf, slashrsm: Make sure form keys are unique.
- #2727781 by Denchev, albertski, slashrsm: Allow tokens in Image Upload Widget
- #2727781 by Denchev: Add test dependency.
- #2684989 by ayalon, slashrsm, jhedstrom: Entity Browser Responsive Modal Dialog
- #2729349 by Dragan Eror: Better classes for tabs.
- #2729757 by dbt102: Update module description.
- #2454049 by Denchev, slashrsm, CTaPByK: Allow modifications to main submit button.
- #2697781 by slashrsm, heddn: Fix Warning: Theme hook entity_browser_propagation not found.
- #2698015 by smaz: core/jquery.once should be a dependency for certain libraries
- #2704863 by TravisCarden: Undefined index: view_mode in RenderedEntity->settingsForm()
- #2689223 by phenaproxima, Primsi, slashrsm: Add a little inline documentation for the various plugin types.
- by slashrsm: Allow hhvm failures.
- #2713155 by phenaproxima: Allow users to provide a path to standalone entity browser
- #2713119 by phenaproxima: Display an informative message if a plugin has no options
- #2710139 by slashrsm, dawehner: Better explain required error message code.
- #2710139 by dawehner: Make a nice required error message
- #2710579 by Sam152: Add config schema for entity browser field widget
- #2708245 by dawehner: Add support for required fields
- #2675390 by slashrsm, Lukas von Blarer, killua99, arknoll, EclipseGc: Symfony\Component\Routing\Exception\MissingMandatoryParametersException: Some mandatory parameters are missing ("machine_name", "step") to generate a URL for route "entity.entity_browser.config_translation_overview"
- #2678664 by slashrsm, Primsi: [Chase IEF] IEF complex widget integration is not working after latest commits in IEF
- #2692899: Fix widget configuration forms with NULL default values
- by slashrsm: Fix tests.
- by slashrsm: Remove double use statement.
- #2685237 by marcingy, slashrsm: Add the ability for entity browser widget to have context.
- #2671810 by Boobaa: Implement configuration form for View widget
- #2683979 by CTaPByK: ESLint check and verify code quality in Entity Browser
- #2366315 by Boobaa: Widget configuration is not saved correctly
- #2679749 by Primsi: Original path no longer passed to view widget
- #2661446 by slashrsm, Primsi: Use FieldWidgetDisplay plugins to display entities in Multi step selection display
- #2674698 by slashrsm, Primsi: [Chase IEF] Rely on IEF for submit and save
- #2671812 by slashrsm, Primsi: Implement configuration form for Entity form widget