1. Add Sidebar component. #2908232: Sidebar Component
2. Issue #2912432: Fix double alias issue by dawehner: Fix double alias issue

Initial release

Initial release.

- Handle empty db driven panes and have some placeholder content to allow contextual links to apply

Added query alter.

* Replace base theme with bootstrap_barrio
* Updated:
* presto_theme to use bootstrap 4
* Social media to 1.2 (from 1.x-dev)
* Simple sitemap to 2.10 (from 2.9)
* Profile to 1.0-rc1 (from 1.0-beta1)
* Paragraphs to 1.2 (from 1.1)
* Google analytics to 2.2 (from 2.1)
* Entity browser to 1.3 (from 1.1)
* Entity to 1.0-beta1 (from 1.0-alpha4)
* Commerce to 2.0 (from 2.0-rc1)
* Removed:
* Commerce stripe