Ultimate Membership Pro 12.9

- Compatibility with Stripe API 2020-08-27

- Compatibility with WordPress v.5.5
- Improve Cropping Avatar step
- Improve LID parameter verification during Register step
- Fix Register Form custom fields submission
- Fix Register Modal workflow with required fields

- Fix Authenticated Stored XSS issue
- Fix Bank Transfer message format
- Improve ULP integration
- Improve Update process from old versions
- Improve DataBase queries performance
- Improve WP MultiSite compatiblity
- Update Social Login setup and process