Bug fixes.

- Fixed typings

- Added new API to check if report has unsaved changes.

Clone visual API.

Bug Fixes.

Add page size and page display options to Page object.

Single visual embed - get/set filters.
SetComponentTitle in order to change the iframe title - for
accessibility compliance.

Bug fixes.

Performance optimizations.

- Fix frontload bug

update to 2.6.3

- API to show/hide visual header.

- Slicer APIs