Gravity Perks - Live Preview 1.6.11

- Added full support for Gravity Forms with improved UI.
- Updated CSS for hidden fields in Gravity Forms 2.5
- Fixed issue where admin script was not output when No Conflict Mode was enabled.
- Fixed issue where tooltips displayed underneath the form editor toolbar. Fixes #5.
- Removed tags in selectors.

Added gplp_grant_preview_permission filter to allow filtering whether the current user has permission to preview forms via Live Preview.

• Fixed PHP notice on trashed forms page in the WordPress admin dashboard.
• Added 'gplp_enable_globally' filter to support enabling preview features for forms outside of core/live preview.