bootstrap 8.x-3.0-beta2

Changes since 8.x-3.0-beta1 (25 commits):

New Features

• #2637888 by markcarver: Use Bootstrap modal instead of jQuery UI modal
• #2636010 by markcarver: Add back bootstrap_modal
• #2266069 by markcarver: Add back bootstrap_carousel
• #2635362 by markcarver: Style system-themes-page.html.twig
• #2635306 by markcarver: Fix edit/hide summary button
• #2634382 by markcarver: Allow process and pre_render plugins to replace/prepend callbacks

Bug Fixes

• #2637924 by markcarver: Bootswatch API URL is broken
• #2637494 by markcarver: The "inline" display label doesn't work
• #2634354 by markcarver: Fix dropbuttons
• #2637798 by markcarver: LESS THEMENAME.libraries.yml is empty
• #2637700 by Sut3kh: overrides.min.css is included when using the less/sass sub-themes
• #2635848 by flocondetoile: default values for region wells not retrieved
• #2634346 by markcarver: Fix CSS overrides
• #2635226 by markcarver, marzie: Changing certain theme settings don't take effect until caches are rebuilt
• #2251919 by Kristina Katalinic, markcarver: Navbar module integration
• #2619542 by rang501: Static/fixed top navbar overlapping Drupal toolbar
• #2633892 by pjcdawkins: Error: Cannot pass parameter 1 by reference in themes/contrib/bootstrap/src/Plugin/ProcessManager.php on line 90
• #2634024 by VBN: Fix fluid container theme setting