[META] First alpha release (8.x-1.0-alpha1)

Problem/Motivation

We need stable alpha or beta release with relatively stable API so people can evaluate base theme with more confidence and don't worry too much about breaking API changes.

Remaining tasks

• Backlog
• In Progress
• Done
  • #2894766: Remove bs_bootstrap gulp Js task
  • #2890739: Bootstrap assets should go to libraries
  • #2878378: Visual look of multi file field is not good
  • #2878380: Improve inline form error support
  • #2870502: Reorginize and clean a bit gulp-options.yml file
  • #2883386: Add support for responsive table column priorities
  • #2883253: Move custom SASS code to partials for easier override in child themes
  • #2883228: Move all sass options to sass map in yaml configuration
  • #2868082: Add BS responsive table support
  • #2858262: Improve form BS support
  • #2881078: Provide grid CSS rules for views grid
  • #2881647: Fix second level menu item for responsive menu
  • #2881687: Attach navigation library to local tasks navigation
  • #2875610: Add BS scrollspy support
  • #2875273: Add BS navs support
  • #2873677: Add BS button plugin support
  • #2875149: Add BS carousel support
  • #2868084: Add BS pager/pagination
  • #2875257: Add BS modal support
  • #2868083: Add BS image support and check should we use BS figure html element
  • #2871432: Add new regions and better CSS layout rules for them
  • #2871438: Add style for node preview switch widget
  • #2861082: Make bs_bootstrap child theme
  • #2840292: Second level navigation with BS drop-down component
  • #2840293: Create example of a child theme
  • #2843824: Upgrade to Bootstrap v4.0.0-alpha.6