Bug fixes

Issue #3018856: Leaflet as default widget Map Library
Better "Gmap Api Key missing" messages to the users.

For branch 1.x, use webform-8.x-5.0-rc29 on Docker (https://github.com/dcycle/webform_submission_change_history/pull/1)

Upstream updates. Add a new campaign_tag field for supporter records. Bump PHP dependency to 7.0.

Full list of changes since 7.x-1.6

• Set @oneline in rem for consistent height. [view commit]
• Styling for select2 autocomplete fields [view commit]
• Improve picker styles [view commit]

Full list of changes since 7.x-1.7

• Fix UA match for Android 9 [view commit]
• JS: disable formstone selecter for select2 fields. [view commit]
• [starterkit] add default select2 styles [view commit]