New features

Issue #2980397 by Ronald van Belzen: Create interfaces for the Lexer and Degenerator classes
Issue #2980305 by Ronald van Belzen: Send mail notifications for new unapproved comments

Better implementation of Custom Map positioning, with Center and Zoom (default and forced) settings,
both for Leaflet Field formatter and Leaflet Views.
Issue #2762903 by PhilippVerpoort, GreenSkunk, joco_sp: Add zoom settings to Views
Note: Existing Leaflet Field formatter settings will be kept for rendering, but would be re-set in the Manage display settings in the edit process.

- Update timeout

Drupal Standard changes

Add example of each saved configuration so that we can see how to get value (s) of saved configuration.

https://github.com/colemanw/webform_civicrm/compare/7.x-4.20...7.x-4.21