Fixed potential PHP 8 warnings.
Fixed notice generated when a rule's field ID property was not a numeric field ID.
- Fixed issue where invalid operators appeared for Current Time conditional logic rules.
- Added support for the `gpcldBaseDate` property to support our new [Auto Rule Groups](https://github.com/gravitywiz/snippet-library/blob/master/gp-conditional-logic-dates/gpcld-auto-rule-groups.php) snippet.
Added support for processing conditions if date fields are HTML5 date inputs.
Fixed issue where conditional logic date/time rules for the Next Button wouldn't reliably save.
Updated minimum WordPress version from 3.4.2 to 5.3.0.
- Fixed potential PHP notices if fields have been deleted.
- Updated default frontend behavior to use the server timezone rather than the visitor's device timezone as the backend logic has always validated using the server timezone.
- Fixed incorrect timezone conversion when using the `gpcld_enable_utc_timezone` JavaScript filter.
- Added "Update URI" to plugin header to improve security.