Releases for Views Contextual Range Filter

1. Remove drupal 8 explicit support
2. Drupal 10 support

The default absolute date format is 2020-12-31, consistent with D8 core Views.
The relative date format (checkbox on Contextual Filter form, bottom) supports natural language phrases like "yesterday", "next week", but also absolute dates like "31 Dec".
Plugins refactored using a PHP trait.
README and project page updated.

Fixes to the DateRange filter.
Support Negate, Multi-ranges (through +), most date specifications and relative dates (eg 'yesterday').
Updated README.

Fixed Issue #2856157 Fatal error: require_once() path failed opening ContextualRangeFilter.php

Upgraded to Release Candidate status

Module is at least partially functional for Drupal 8.2.
Numeric and Date ranges have been tested.
After making changes to the module configuration, the cache needs to be manually cleared.

Remove type hint introduced with PHP 5.4 so that everything still works for PHP 5.3.9 or later.

Fix for date ranges.
Mention on Status Report page that PHP v5.3.9 or later is required for recent versions of the module. Use 7.x-1.1 for PHP < v5.3.9.

Fixed notices regarding null arguments.

Auto-save Views for which contextual range filter has been added or removed.

Update .yml to new standard.

Port from 7.x-1.1.
Lists supported, but only via their (numeric) keys, not via their human-readable list values.

A "from" or "to" value of 0 was interpreted as "open-ended" rather than zero.

Update help text.

Refactor to reduce amount of code.
Added list support.
Updated README.