Gravity Forms 2.8.8

- API: Added GFAPI::log_debug() and GFAPI::log_error() which write to the "Gravity Forms API" log.
- API: Added logging helpers and logging statements to various methods in REST API v2.
- API: Updated REST API v1 to write to the "Gravity Forms API" log.

- Updated the system report to include timezone details.
- Updated the minimum version of WordPress required for support to 5.1.
- Fixed an issue with submitting when multiple AJAX enabled forms are embedded into one page and invisible reCAPTCHAs are present.
- Fixed an issue when tabbing through a form where an invisible reCAPTCHA is present.
- Fixed an issue where a field's character count text could duplicate when submitting an AJAX enabled form.

Fixed a database error when getting REST API keys on a sub-site of a WordPress multi-site installation.
- Updated Forms block to load when Gutenberg Add-On is activated.