WP Cost Estimation & Payment Forms Builder 10.1.86

- new glassmorphism theme for the backend
- new glassmorphism theme for frontend forms
- backend theme system (light, dark and glassmorphic, choice of background gradient)
- improvement of the entire UI in the backend
- many fixes and improvements

- design of the backend improved
- minor corrections & improvements

- form Designer tool improved
- backend UI improved
- Mailchimp library upgraded
- rows can now have visibility conditions
- signature module issue fixed
- minor corrections & improvements